diff --git a/src/application/config/constants.php b/src/application/config/constants.php
index aa25e87f..994944c4 100644
--- a/src/application/config/constants.php
+++ b/src/application/config/constants.php
@@ -58,5 +58,17 @@ define('AJAX_FAILURE', 'FAILURE');
 
 define('SETTINGS_SYSTEM', 'SETTINGS_SYSTEM');
 define('SETTINGS_USER', 'SETTINGS_USER');
+
+define('PRIV_VIEW', 1);
+define('PRIV_ADD', 2);
+define('PRIV_EDIT', 4);
+define('PRIV_DELETE', 8);
+
+define('PAGE_APPOINTMENTS', 'appointments');
+define('PAGE_CUSTOMERS', 'customers');
+define('PAGE_SERVICES', 'services');
+define('PAGE_USERS', 'users');
+define('PAGE_SYSTEM_SETTINGS', 'system_settings');
+define('PAGE_USER_SETTINGS', 'user_settings');
 /* End of file constants.php */
 /* Location: ./application/config/constants.php */
\ No newline at end of file
diff --git a/src/application/controllers/backend.php b/src/application/controllers/backend.php
index 2668b725..e12587af 100644
--- a/src/application/controllers/backend.php
+++ b/src/application/controllers/backend.php
@@ -1,6 +1,11 @@
 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 
 class Backend extends CI_Controller {
+    public function __construct() {
+        parent::__construct();
+        $this->load->library('session');
+    }
+    
     /**
      * Display the main backend page.
      * 
@@ -13,7 +18,8 @@ class Backend extends CI_Controller {
      * appear when the page loads.
      */
     public function index($appointment_hash = '') {
-        // @task Require user to be logged in the application.
+        $this->session->set_userdata('dest_url', $this->config->item('base_url') . 'backend');
+        if (!$this->hasPrivileges(PAGE_APPOINTMENTS)) return;
         
         $this->load->model('appointments_model');
         $this->load->model('providers_model');
@@ -47,7 +53,8 @@ class Backend extends CI_Controller {
      * In this page the user can manage all the customer records of the system.
      */
     public function customers() {
-    	// @task Require user to be logged in the application.
+        $this->session->set_userdata('dest_url', $this->config->item('base_url') . 'backend/customers');
+    	if (!$this->hasPrivileges(PAGE_CUSTOMERS)) return;
     	
         $this->load->model('providers_model');
         $this->load->model('customers_model');
@@ -75,7 +82,8 @@ class Backend extends CI_Controller {
      * from the backend services page. 
      */
     public function services() {
-        // @task Require user to be logged in the application.
+        $this->session->set_userdata('dest_url', $this->config->item('base_url') . 'backend/services');
+        if (!$this->hasPrivileges(PAGE_SERVICES)) return;
         
         $this->load->model('customers_model');
         $this->load->model('services_model');
@@ -99,7 +107,8 @@ class Backend extends CI_Controller {
      * the page where the admin defines which service can each provider provide.
      */
     public function users() {
-        // @task Require user to be logged in the application.
+        $this->session->set_userdata('dest_url', $this->config->item('base_url') . 'backend/users');
+        if (!$this->hasPrivileges(PAGE_USERS)) return;
         
         $this->load->model('providers_model');
         $this->load->model('secretaries_model');
@@ -127,6 +136,10 @@ class Backend extends CI_Controller {
      * installation (core settings like company name, book timeout etc). 
      */
     public function settings() {
+        $this->session->set_userdata('dest_url', $this->config->item('base_url') . 'backend/settings');
+        if (!$this->hasPrivileges(PAGE_SYSTEM_SETTINGS)
+                && !$this->hasPrivileges(PAGE_USER_SETTINGS)) return;
+        
         $this->load->model('settings_model');
         $this->load->model('user_model');
         
@@ -148,6 +161,48 @@ class Backend extends CI_Controller {
         $this->load->view('backend/settings', $view);
         $this->load->view('backend/footer', $view);
     }
+    
+    /**
+     * Check whether current user is logged in and has the required privileges to 
+     * view a page. 
+     * 
+     * The backend page requires different privileges from the users to display pages. Not all
+     * pages are avaiable to all users. For example secretaries should not be able to edit the
+     * system users.
+     * 
+     * @see Constant Definition In application/config/constants.php
+     * 
+     * @param string $page This argument must match the roles field names of each section 
+     * (eg "appointments", "users" ...).
+     * @param bool $redirect (OPTIONAL - TRUE) If the user has not the required privileges
+     * (either not logged in or insufficient role privileges) then the user will be redirected  
+     * to another page. Set this argument to FALSE when using ajax.
+     * @return bool Returns whether the user has the required privileges to view the page or
+     * not. If the user is not logged in then he will be prompted to log in. If he hasn't the
+     * required privileges then an info message will be displayed.
+     */
+    private function hasPrivileges($page, $redirect = TRUE) {       
+        // Check if user is logged in.
+        $user_id = $this->session->userdata('user_id');
+        if ($user_id == FALSE) { // User not logged in, display the login view.
+            if ($redirect) {
+                header('Location: ' . $this->config->item('base_url') . 'user/login');
+            }
+            return FALSE;
+        }
+        
+        // Check if the user has the required privileges for viewing the selected page.
+        $role_slug = $this->session->userdata('role_slug');
+        $role_priv = $this->db->get_where('ea_roles', array('slug' => $role_slug))->row_array();
+        if ($role_priv[$page] < PRIV_VIEW) { // User does not have the permission to view the page.
+             if ($redirect) {
+                header('Location: ' . $this->config->item('base_url') . 'user/no_privileges');
+            }
+            return FALSE;
+        }
+        
+        return TRUE;
+    }
 }
 
 /* End of file backend.php */
diff --git a/src/application/controllers/backend_api.php b/src/application/controllers/backend_api.php
index 79a08689..b864c18d 100644
--- a/src/application/controllers/backend_api.php
+++ b/src/application/controllers/backend_api.php
@@ -811,10 +811,8 @@ class Backend_api extends CI_Controller {
                 $settings = json_decode($_POST['settings'], true);
                 $this->settings_model->save_settings($settings);
             } else if ($_POST['type'] == SETTINGS_USER) {
-                $this->load->library('session');
                 $this->load->model('user_model');
-                $user_id = $this->session->userdata('user_id');
-                $this->user_model->save_settings($_POST['settings'], $user_id);
+                $this->user_model->save_settings(json_decode($_POST['settings'], true));
             }
             
             echo json_encode(AJAX_SUCCESS);
diff --git a/src/application/controllers/user.php b/src/application/controllers/user.php
new file mode 100644
index 00000000..c3bb6a05
--- /dev/null
+++ b/src/application/controllers/user.php
@@ -0,0 +1,62 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+
+class User extends CI_Controller {
+    public function __construct() {
+        parent::__construct();
+        $this->load->library('session');
+    }
+    
+    public function index() {
+        header('Location: ' . $this->config->item('base_url') . 'user/login');
+    }
+    
+    public function login() {
+        $view['base_url'] = $this->config->item('base_url');
+        $view['dest_url'] = $this->session->userdata('dest_url');
+        $this->load->view('user/login', $view);
+    }
+    
+    public function logout() {
+        
+    }
+    
+    public function forgot_password() {
+        
+    }
+    
+    public function no_privileges() {
+        // can't view the requested page.
+    }
+    
+    /**
+     * [AJAX] Check whether the user has entered the correct login credentials.
+     */
+    public function ajax_check_login() {
+        try {
+            if (!isset($_POST['username']) || !isset($_POST['password'])) {
+                throw new Exception('Invalid credentials given!');
+            }
+            
+            $this->load->helper('general');
+            $this->load->model('user_model');
+            
+            $hash_password = $this->hash_password($_POST['password']);
+            $user_data = $this->user_model->check_login($_POST['username'], $hash_password);
+            
+            if ($user_data) {
+                $this->session->set_userdata($user_data); // Save data on user's session.
+                echo json_encode(AJAX_SUCCESS);
+            } else {
+                echo json_encode(AJAX_SUCCESS);
+            }
+            
+        } catch(Exception $exc) {
+            echo json_encode(array(
+                'exceptions' => array(exceptionToJavaScript($exc))
+            ));
+        }
+    }
+}
+
+/* End of file user.php */
+/* Location: ./application/controllers/user.php */
\ No newline at end of file
diff --git a/src/application/helpers/general_helper.php b/src/application/helpers/general_helper.php
index 0066474a..8f31c5a0 100644
--- a/src/application/helpers/general_helper.php
+++ b/src/application/helpers/general_helper.php
@@ -25,5 +25,18 @@ function date3339($timestamp=0) {
     return $date;
 }
 
+/**
+ * Generate a hash of password string.
+ * 
+ * For user security, all system passwords are stored in hash string into the database. Use
+ * this method to produce the hash.
+ * 
+ * @param string $password Given string password.
+ * @return string Returns the hash string of the given password.
+ */
+function hash_password($password) {
+    return md5($password); // @task include salt and hash more times.
+}
+
 /* End of file general_helper.php */
 /* Location: ./application/helpers/general_helper.php */
\ No newline at end of file
diff --git a/src/application/models/user_model.php b/src/application/models/user_model.php
index fbacc999..0fb003e8 100644
--- a/src/application/models/user_model.php
+++ b/src/application/models/user_model.php
@@ -18,22 +18,32 @@ class User_Model extends CI_Model {
      * @return array Returns an array with user settings.
      */
     public function get_settings($user_id) {
-        $settings = $this->db->get_where('ea_user_settings', array('id_users' => $user_id))->row_array();
-        unset($settings['id_users']);
-        return $settings;
+        $user = $this->db->get_where('ea_users', array('id' => $user_id))->row_array();
+        $user['settings'] = $this->db->get_where('ea_user_settings', array('id_users' => $user_id))->row_array();
+        unset($user['settings']['id_users']);
+        return $user;
     }
     
     /**
      * This method saves the user settings into the database.
      * 
-     * @param array $settings Contains the current users settings.
-     * @param numeric $user_id User record id of the settings.
+     * @param array $user Contains the current users settings.
      * @return bool Returns the operation result.
      */
-    public function save_settings($settings, $user_id) {
-        $settings['id_users'] = $user_id;
-        $this->db->where('id_users', $user_id);
-        return $this->db->update('ea_user_settings', $settings);
+    public function save_settings($user) {
+        $user_settings = $user['settings'];
+        $user_settings['id_users'] = $user['id'];
+        unset($user['settings']);
+        
+        if (!$this->db->update('ea_users', $user, array('id' => $user['id']))) {
+            return FALSE;
+        }
+        
+        if (!$this->db->update('ea_user_settings', $user_settings, array('id_users' => $user['id']))) {
+            return FALSE;
+        }
+        
+        return TRUE;
     }
 }
 
diff --git a/src/application/views/backend/settings.php b/src/application/views/backend/settings.php
index 9a86721c..7487582b 100644
--- a/src/application/views/backend/settings.php
+++ b/src/application/views/backend/settings.php
@@ -91,7 +91,7 @@
                             record.</strong> After that you can add break periods.
                         </span>
                         
-                        <table class="working-hours table table-striped">
+                        <table class="working-plan table table-striped">
                             <thead>
                                 <tr>
                                     <th>Day</th>
@@ -102,38 +102,38 @@
                             <tbody>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="monday" />Monday</label></td>
-                                    <td><input type="text" id="monday-start" /></td>
-                                    <td><input type="text" id="monday-end" /></td>
+                                    <td><input type="text" id="monday-start" class="work-start" /></td>
+                                    <td><input type="text" id="monday-end" class="work-end" /></td>
                                 </tr>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="tuesday" />Tuesday</label></td>
-                                    <td><input type="text" id="tuesday-start" /></td>
-                                    <td><input type="text" id="tuesday-end" /></td>
+                                    <td><input type="text" id="tuesday-start" class="work-start" /></td>
+                                    <td><input type="text" id="tuesday-end" class="work-end" /></td>
                                 </tr>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="wednesday" />Wednesday</label></td>
-                                    <td><input type="text" id="wednesday-start" /></td>
-                                    <td><input type="text" id="wednesday-end" /></td>
+                                    <td><input type="text" id="wednesday-start" class="work-start" /></td>
+                                    <td><input type="text" id="wednesday-end" class="work-end" /></td>
                                 </tr>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="thursday" />Thursday</label></td>
-                                    <td><input type="text" id="thursday-start" /></td>
-                                    <td><input type="text" id="thursday-end" /></td>
+                                    <td><input type="text" id="thursday-start" class="work-start" /></td>
+                                    <td><input type="text" id="thursday-end" class="work-end" /></td>
                                 </tr>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="friday" />Friday</label></td>
-                                    <td><input type="text" id="friday-start" /></td>
-                                    <td><input type="text" id="friday-end" /></td>
+                                    <td><input type="text" id="friday-start" class="work-start" /></td>
+                                    <td><input type="text" id="friday-end" class="work-end" /></td>
                                 </tr>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="saturday" />Saturday</label></td>
-                                    <td><input type="text" id="saturday-start" /></td>
-                                    <td><input type="text" id="saturday-end" /></td>
+                                    <td><input type="text" id="saturday-start" class="work-start" /></td>
+                                    <td><input type="text" id="saturday-end" class="work-end" /></td>
                                 </tr>
                                 <tr>
                                     <td><label class="checkbox"><input type="checkbox" id="sunday" />Sunday</label></td>
-                                    <td><input type="text" id="sunday-start" /></td>
-                                    <td><input type="text" id="sunday-end" /></td>
+                                    <td><input type="text" id="sunday-start" class="work-start" /></td>
+                                    <td><input type="text" id="sunday-end" class="work-end" /></td>
                                 </tr>
                             </tbody>
                         </table>
@@ -206,16 +206,16 @@
                 <input type="text" id="first-name" class="span9" />
                 
                 <label for="last-name">Last Name *</label>
-                <input type="text" id="last-name" class="span9" />
+                <input type="text" id="last-name" class="span9 required" />
                 
                 <label for="email">Email *</label>
-                <input type="text" id="email" class="span9" />
+                <input type="text" id="email" class="span9 required" />
                 
                 <label for="mobile-number">Mobile Number</label>
                 <input type="text" id="mobile-number" class="span9" />
                 
-                <label for="phone-number">Phone Number</label>
-                <input type="text" id="phone-number" class="span9" />
+                <label for="phone-number">Phone Number *</label>
+                <input type="text" id="phone-number" class="span9 required" />
                 
                 <label for="address">Address</label>
                 <input type="text" id="address" class="span9" />
@@ -237,17 +237,17 @@
                 <legend>Miscellaneous</legend>
                 
                 <label for="username">Username *</label>
-                <input type="text" id="username" />
+                <input type="text" id="username" class="required" />
                 
-                <label for="password">Password *</label>
-                <input type="text" id="password" />
+                <label for="password">Password</label>
+                <input type="password" id="password" />
                 
-                <label for="retype-password">Retype Password *</label>
-                <input type="text" id="retype-password" />
+                <label for="retype-password">Retype Password</label>
+                <input type="password" id="retype-password" />
                 
                 <br>
                 
-                <button type="button" class="btn" data-toggle="button">
+                <button type="button" id="user-notifications" class="btn" data-toggle="button">
                     <i class="icon-asterisk"></i>
                     Receive Email Notifications
                 </button>
diff --git a/src/application/views/user/forgot_password.php b/src/application/views/user/forgot_password.php
new file mode 100644
index 00000000..b6eddc13
--- /dev/null
+++ b/src/application/views/user/forgot_password.php
@@ -0,0 +1,7 @@
+<?php
+
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+?>
diff --git a/src/application/views/user/login.php b/src/application/views/user/login.php
new file mode 100644
index 00000000..36febafa
--- /dev/null
+++ b/src/application/views/user/login.php
@@ -0,0 +1,121 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+    
+    <?php // INCLUDE JS FILES ?>
+    <script 
+        type="text/javascript" 
+        src="<?php echo $this->config->base_url(); ?>assets/js/libs/jquery/jquery.min.js"></script>
+    <script 
+        type="text/javascript" 
+        src="<?php echo $this->config->base_url(); ?>assets/js/libs/bootstrap/bootstrap.min.js"></script>
+    <script 
+        type="text/javascript" 
+        src="<?php echo $this->config->base_url(); ?>assets/js/libs/date.js"></script>
+    <script 
+        type="text/javascript" 
+        src="<?php echo $this->config->base_url(); ?>assets/js/general_functions.js"></script>
+        
+    <?php // INCLUDE CSS FILES ?>
+    <link 
+        rel="stylesheet" 
+        type="text/css" 
+        href="<?php echo $this->config->base_url(); ?>assets/css/libs/bootstrap/bootstrap.css">
+    <link 
+        rel="stylesheet" 
+        type="text/css" 
+        href="<?php echo $this->config->base_url(); ?>assets/css/libs/bootstrap/bootstrap-responsive.css">
+    
+    <?php // SET FAVICON FOR PAGE ?>
+    <link 
+        rel="icon" 
+        type="image/x-icon" 
+        href="<?php echo $this->config->base_url(); ?>assets/images/favicon.ico">
+    
+    <style>
+        body {
+            background-color: #CAEDF3;
+        }
+        
+        #login-frame {
+            width: 630px;
+            margin: 150px auto 0 auto;
+            background: #FFF;
+            border: 1px solid #DDDADA;
+            padding: 70px;
+        }
+        
+        #login-icon {
+            float: right;
+            margin-top: 17px;
+        }
+        
+        label {
+            font-weight: bold;
+        }
+        
+        .forgot-password {
+            margin-left: 20px;
+        }
+    </style>
+    
+    <script>
+        $(document).ready(function() {
+            var GlobalVariables = {
+                'baseUrl': <?php echo '"' . $base_url . '"'; ?>,
+                'destUrl': <?php echo '"' . $dest_url . '"'; ?>
+            };
+            
+            /**
+             * Event: Login Button "Click"
+             * 
+             * Make an ajax call to the server and check whether the user's credentials are right. 
+             * If yes then redirect him to his desired page, otherwise display a message.
+             */
+            $('#login').click(function() {
+                var postUrl = GlobalVariables.baseUrl . 'user/ajax_check_login';
+                var postData = {
+                    'username': $('#username').val(),
+                    'password': $('#password').val()
+                };
+                
+                $.post(postUrl, postData, function(response) {
+                    //////////////////////////////////////////////////
+                    console.log('Check Login Response: ', response);
+                    //////////////////////////////////////////////////
+                    
+                    if (response == true) {
+                        location(GlobalVariables.destUrl);
+                    } else {
+                        $('.alert').text('Login failed, please enter the correct credentials '
+                            + 'and try again.');
+                        $('.alert').removeClass('hidden');
+                    }
+                });
+            });
+        });
+    </script>
+</head>
+<body>
+    <div id="login-frame" class="frame-container">
+        <h2>Login Required</h2>
+        <p>Welcome! You will need to login in order to view this page.</p>  
+        <hr>
+        <div class="alert hidden"></div>  
+        <form>
+            <label for="username">Username</label>
+            <input type="text" id="username" placeholder="Enter your username here ..." />
+            
+            <label for="password">Password</label>
+            <input type="password" id="password" placeholder="Enter your password here ..." />    
+            
+            <br><br>
+            
+            <button type="button" id="login" class="btn btn-primary btn-large">Login</button> 
+            
+            <a href="<?php echo $base_url; ?>user/forgot_password" class="forgot-password">Forgot Your Password?</a>
+        </form>
+    </div>
+</body>
+</html>
\ No newline at end of file
diff --git a/src/application/views/user/logout.php b/src/application/views/user/logout.php
new file mode 100644
index 00000000..b6eddc13
--- /dev/null
+++ b/src/application/views/user/logout.php
@@ -0,0 +1,7 @@
+<?php
+
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+?>
diff --git a/src/application/views/user/no_privileges.php b/src/application/views/user/no_privileges.php
new file mode 100644
index 00000000..b6eddc13
--- /dev/null
+++ b/src/application/views/user/no_privileges.php
@@ -0,0 +1,7 @@
+<?php
+
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+?>
diff --git a/src/assets/css/backend.css b/src/assets/css/backend.css
index c61dfd64..d1a45a5d 100644
--- a/src/assets/css/backend.css
+++ b/src/assets/css/backend.css
@@ -384,12 +384,12 @@ body .modal-header h3 {
     cursor: pointer; 
 }
 
-#business-logic .working-hours td input[type="text"] {
+#business-logic .working-plan td input[type="text"] {
     margin-bottom: 0;
     cursor: pointer;
 }
 
-#business-logic .working-hours label.checkbox {
+#business-logic .working-plan label.checkbox {
     margin-top: 5px;
     margin-bottom: 0;
 }
diff --git a/src/assets/js/backend.js b/src/assets/js/backend.js
index 22ca9270..99b32ed7 100644
--- a/src/assets/js/backend.js
+++ b/src/assets/js/backend.js
@@ -36,23 +36,21 @@ var Backend = {
     
     /**
      * Place the backend footer always on the bottom of the page.
-     * 
-     * @task Re-enable this method.
      */
     placeFooterToBottom: function() {
-//        var $footer = $('#footer');
-//
-//        if (window.innerHeight > $('body').height()) {
-//            $footer.css({
-//                'position': 'absolute',
-//                'width': '100%',
-//                'bottom': '0px'
-//            });
-//        } else {
-//            $footer.css({
-//                'position': 'static'
-//            });
-//        }
+        var $footer = $('#footer');
+
+        if (window.innerHeight > $('body').height()) {
+            $footer.css({
+                'position': 'absolute',
+                'width': '100%',
+                'bottom': '0px'
+            });
+        } else {
+            $footer.css({
+                'position': 'static'
+            });
+        }
     },
 
     /**
diff --git a/src/assets/js/backend_settings.js b/src/assets/js/backend_settings.js
index cfc7728c..130721f1 100644
--- a/src/assets/js/backend_settings.js
+++ b/src/assets/js/backend_settings.js
@@ -42,7 +42,7 @@ var BackendSettings = {
     initialize: function(bindEventHandlers) {
         if (bindEventHandlers == undefined) bindEventHandlers = true;
         
-        // Apply values from database.
+        // Apply setting values from database.
         $.each(GlobalVariables.settings.system, function(index, setting) {
             $('input[data-field="' + setting.name + '"]').val(setting.value);
         });
@@ -93,19 +93,50 @@ var BackendSettings = {
         });
         
         // Make break cells editable.
-        BackendSettings.breakDayEditable($('#breaks .break-day'));
-        BackendSettings.breakTimeEditable($('#breaks').find('.break-start, .break-end'));
+        BackendSettings.editableBreakDay($('#breaks .break-day'));
+        BackendSettings.editableBreakTime($('#breaks').find('.break-start, .break-end'));
         
         // Set timepickers where needed.
-        $('.working-hours input').timepicker({
-            timeFormat: 'HH:mm'
+        $('.working-plan input').timepicker({
+            'timeFormat': 'HH:mm',
+            'onSelect': function(datetime, inst) {
+                // Start time must be earlier than end time. 
+                var start = Date.parse($(this).parent().parent().find('.work-start').val());
+                var end = Date.parse($(this).parent().parent().find('.work-end').val());
+                
+                if (start > end) {
+                    $(this).parent().parent().find('.work-end').val(start.addHours(1).toString('HH:mm'));
+                }
+            }
         });
         
         // Book Advance Timeout Spinner
         $('#book-advance-timeout').spinner({
-            min: 0
+            'min': 0
         });
         
+        // Load user settings into form
+        $('#user-id').val(GlobalVariables.settings.user.id);
+        $('#first-name').val(GlobalVariables.settings.user.first_name);
+        $('#last-name').val(GlobalVariables.settings.user.last_name);
+        $('#email').val(GlobalVariables.settings.user.email);
+        $('#mobile-number').val(GlobalVariables.settings.user.mobile_number);
+        $('#phone-number').val(GlobalVariables.settings.user.phone_number);
+        $('#address').val(GlobalVariables.settings.user.address);
+        $('#city').val(GlobalVariables.settings.user.city);
+        $('#state').val(GlobalVariables.settings.user.state);
+        $('#zip-code').val(GlobalVariables.settings.user.zip_code);
+        $('#notes').val(GlobalVariables.settings.user.notes);
+        
+        $('#username').val(GlobalVariables.settings.user.settings.username);
+        $('#password, #retype-password').val('');
+        
+        if (GlobalVariables.settings.user.settings.notifications == true) { 
+            $('#user-notifications').addClass('active');
+        } else {
+            $('#user-notifications').removeClass('active');
+        }
+        
         // Set default settings helper.
         BackendSettings.settings = new SystemSettings();
         
@@ -114,6 +145,10 @@ var BackendSettings = {
         }
     },
             
+    /**
+     * Bind the backend/settings default event handlers. This method depends on the 
+     * backend/settings html, so do not use this method on a different page.
+     */
     bindEventHandlers: function() {
         /**
          * Event: Tab "Click"
@@ -121,6 +156,11 @@ var BackendSettings = {
          * Change the visible tab contents.
          */
         $('.tab').click(function() {
+            // Bootstrap has a bug with toggle buttons. Their toggle state is lost when the
+            // button is hidden or shown. Show before anything else we need to store the toggle 
+            // and apply it whenever the user tab is clicked..
+            var areNotificationsActive = $('#user-notifications').hasClass('active');
+            
             $('.active').removeClass('active');
             $(this).addClass('active');
             $('.tab-content').hide();
@@ -134,6 +174,13 @@ var BackendSettings = {
             } else if ($(this).hasClass('user-tab')) {
                 $('#user').show();
                 BackendSettings.settings = new UserSettings();
+               
+                // Apply toggle state to user notifications button.
+                if (areNotificationsActive) {
+                    $('#user-notifications').addClass('active');
+                } else {
+                    $('#user-notifications').removeClass('active');   
+                }
             }
         });
         
@@ -145,6 +192,9 @@ var BackendSettings = {
         $('.save-settings').click(function() {
             var settings = BackendSettings.settings.get();
             BackendSettings.settings.save(settings);
+            //////////////////////////////////////////////
+            console.log('Settings To Save: ', settings);
+            //////////////////////////////////////////////
         });
         
         /**
@@ -152,7 +202,7 @@ var BackendSettings = {
          * 
          * Enable or disable the time selection for each day.
          */
-        $('.working-hours input[type="checkbox"]').click(function() {
+        $('.working-plan input[type="checkbox"]').click(function() {
             var id = $(this).attr('id');
             
             if ($(this).prop('checked') == true) {
@@ -195,8 +245,8 @@ var BackendSettings = {
             
             // Bind editable and event handlers.
             tr = $('#breaks tr').get()[1];
-            BackendSettings.breakDayEditable($(tr).find('.break-day'));
-            BackendSettings.breakTimeEditable($(tr).find('.break-start, .break-end'));
+            BackendSettings.editableBreakDay($(tr).find('.break-day'));
+            BackendSettings.editableBreakTime($(tr).find('.break-start, .break-end'));
             $(tr).find('.edit-break').trigger('click');
         });
         
@@ -252,6 +302,13 @@ var BackendSettings = {
          * Save the editable values and restore the table to its initial state.
          */
         $(document).on('click', '.save-break', function() {
+            // Break's start time must always be prior to break's end. 
+            var start = Date.parse($(this).parent().parent().find('.break-start input').val());
+            var end = Date.parse($(this).parent().parent().find('.break-end input').val());
+            if (start > end) {
+                $(this).parent().parent().find('.break-end  input').val(start.addHours(1).toString('HH:mm'));
+            }
+            
             BackendSettings.enableSubmit = true;
             $(this).parent().parent().find('.editable .submit-editable').trigger('click');
             BackendSettings.enableSubmit = false;
@@ -266,7 +323,7 @@ var BackendSettings = {
      * 
      * @param {object} $selector The cells to be initialized.
      */
-    breakDayEditable: function($selector) {
+    editableBreakDay: function($selector) {
         $selector.editable(function(value, settings) {
             return value;
         }, {
@@ -293,7 +350,7 @@ var BackendSettings = {
      * 
      * @param {object} $selector The cells to be initialized.
      */        
-    breakTimeEditable: function($selector) {
+    editableBreakTime: function($selector) {
         $selector.editable(function(value, settings) {
             // Do not return the value because the user needs to press the "Save" button.
             return value;
@@ -362,13 +419,27 @@ SystemSettings.prototype.get = function() {
     
     // Business Logic Tab
     var workingPlan = {};
-    $('.working-hours input[type="checkbox"').each(function() {
+    $('.working-plan input[type="checkbox"').each(function() {
         var id = $(this).attr('id');
         if ($(this).prop('checked') == true) {
             workingPlan[id] = {}
             workingPlan[id].start = $('#' + id + '-start').val();
             workingPlan[id].end = $('#' + id + '-end').val();
-            workingPlan[id].breaks = {};
+            workingPlan[id].breaks = [];
+            
+            $('#breaks tr').each(function(index, tr) {
+                var day = $(tr).find('.break-day').text().toLowerCase();
+                if (day == id) {
+                    var start = $(tr).find('.break-start').text();
+                    var end = $(tr).find('.break-end').text();
+                    
+                    workingPlan[id].breaks.push({
+                        'start': start,
+                        'end': end
+                    });
+                    
+                }
+            });
             
         } else {
             workingPlan[id] = null;
@@ -380,6 +451,11 @@ SystemSettings.prototype.get = function() {
         'value': JSON.stringify(workingPlan)
     });
     
+    settings.push({
+        'name': 'book_advance_timeout',
+        'value': $('#book-advance-timeout').val()
+    });
+    
     return settings;
 };
 
@@ -390,7 +466,32 @@ SystemSettings.prototype.get = function() {
  * @returns {bool} Returns the validation result.
  */
 SystemSettings.prototype.validate = function() {
+    $('#general .required').css('border', '');
     
+    try {
+        // Validate required fields.
+        var missingRequired = false;
+        $('#general .required').each(function() {
+            if ($(this).val() == '' || $(this).val() == undefined) {
+                $(this).css('border', '2px solid red');
+                missingRequired = true;
+            }
+        });
+        if (missingRequired) {
+            throw 'Fields with * are  required.';
+        }
+        
+        // Validate company email address.
+        if (!GeneralFunctions.validateEmail($('#company-email').val())) {
+            $('#company-email').css('border', '2px solid red');
+            throw 'Invalid email address!';
+        }
+        
+        return true;
+    } catch(exc) {
+        Backend.displayNotification(exc);
+        return false;
+    }
 };
 
 /**
@@ -402,10 +503,33 @@ var UserSettings = function() {};
 /**
  * Get the settings data for the user settings.
  * 
- * @returns {array} Returns the user settings array.
+ * @returns {object} Returns the user settings array.
  */
 UserSettings.prototype.get = function() {
+    var user = {
+        'id': $('#user-id').val(),
+        'first_name': $('#first-name').val(),
+        'last_name': $('#last-name').val(),
+        'email': $('#email').val(),
+        'mobile_number': $('#mobile-number').val(),
+        'phone_number': $('#phone-number').val(),
+        'address': $('#address').val(),
+        'city': $('#city').val(),
+        'state': $('#state').val(),
+        'zip_code': $('#zip-code').val(),
+        'notes': $('#notes').val(),
+        'settings': {
+            'username': $('#username').val(),
+            'password': $('#password').val(),
+            'notifications': $('#user-notifications').hasClass('active')
+        }
+    };
     
+    if ($('#password').val() != '') {
+        user.settings.password = $('#password').val();
+    }
+    
+    return user;
 };
 
 /**
@@ -414,7 +538,27 @@ UserSettings.prototype.get = function() {
  * @param {array} settings Contains the user settings.
  */
 UserSettings.prototype.save = function(settings) {
+    if (!BackendSettings.settings.validate(settings)) {
+        Backend.displayNotification('User settings are invalid! Please review your settings '
+                + 'and try again.');
+        return; // Validation failed, do not procceed.
+    }
     
+    var postUrl = GlobalVariables.baseUrl + 'backend_api/ajax_save_settings';
+    var postData = {
+        'type': BackendSettings.SETTINGS_USER,
+        'settings': JSON.stringify(settings)
+    };
+    
+    $.post(postUrl, postData, function(response) {
+        //////////////////////////////////////////////////////////
+        console.log('Save User Settings Response: ', response);
+        //////////////////////////////////////////////////////////
+        
+        if (!Backend.handleAjaxExceptions(response)) return;
+        Backend.displayNotification('Settings saved successfully!');
+        
+    }, 'json');
 };
 
 /**
@@ -424,5 +568,37 @@ UserSettings.prototype.save = function(settings) {
  * @returns {bool} Returns the validation result.
  */
 UserSettings.prototype.validate = function() {
-    
+    $('#user .required').css('border', '');
+    $('#user').find('#password, #retype-password').css('border', '');
+
+    try {
+        // Validate required fields.
+        var missingRequired = false;
+        $('#user .required').each(function() {
+            if ($(this).val() == '' || $(this).val() == undefined) {
+                $(this).css('border', '2px solid red');
+                missingRequired = true;
+            }
+        });
+        if (missingRequired) {
+            throw 'Fields with * are  required.';
+        }
+        
+        // Validate passwords (if provided).
+        if ($('#password').val() != $('#retype-password').val()) {
+            $('#password, #retype-password').css('border', '2px solid red');
+            throw 'Passwords mismatch!';
+        }
+        
+        // Validate user email.
+        if (!GeneralFunctions.validateEmail($('#email').val())) {
+            $('#email').css('border', '2px solid red');
+            throw 'Invalid email address!';
+        }
+        
+        return true;
+    } catch(exc) {
+        Backend.displayNotification(exc);
+        return false;
+    }
 };
diff --git a/src/assets/js/backend_users.js b/src/assets/js/backend_users.js
index 6944bc2b..c29040aa 100644
--- a/src/assets/js/backend_users.js
+++ b/src/assets/js/backend_users.js
@@ -589,6 +589,12 @@ AdminsHelper.prototype.validate = function(admin) {
             throw 'Passwords mismatch!';
         }
         
+        // Validate user email.
+        if (!GeneralFunctions.validateEmail($('#admin-email').val())) {
+            $('#admin-email').css('border', '2px solid red');
+            throw 'Invalid email address!';
+        }
+        
         return true;
     } catch(exc) {
         $('#admins .form-message').text(exc);
@@ -611,6 +617,8 @@ AdminsHelper.prototype.resetForm = function() {
     $('#admins .form-message').hide();    
     $('#admin-notifications').removeClass('active');
     $('#admin-notifications').prop('disabled', true);
+    $('#admins .required').css('border', '');
+    $('#admin-password, #admin-password-confirm').css('border', '');
 };
 
 /**
@@ -764,6 +772,12 @@ ProvidersHelper.prototype.validate = function(provider) {
             throw 'Passwords mismatch!';
         }
         
+        // Validate user email.
+        if (!GeneralFunctions.validateEmail($('#provider-email').val())) {
+            $('#provider-email').css('border', '2px solid red');
+            throw 'Invalid email address!';
+        }
+        
         return true;
     } catch(exc) {
         $('#providers .form-message').text(exc);
@@ -788,6 +802,8 @@ ProvidersHelper.prototype.resetForm = function() {
     $('#provider-notifications').prop('disabled', true);
     $('#provider-services input[type="checkbox"]').prop('checked', false);
     $('#provider-services input[type="checkbox"]').prop('disabled', true);
+    $('#providers .required').css('border', '');
+    $('#provider-password, #provider-password-confirm').css('border', '');
 };
 
 /**
@@ -950,6 +966,12 @@ SecretariesHelper.prototype.validate = function(secretary) {
             throw 'Passwords mismatch!';
         }
         
+        // Validate user email.
+        if (!GeneralFunctions.validateEmail($('#secretary-email').val())) {
+            $('#secretary-email').css('border', '2px solid red');
+            throw 'Invalid email address!';
+        }
+        
         return true;
     } catch(exc) {
         $('#secretaries .form-message').text(exc);
@@ -974,6 +996,8 @@ SecretariesHelper.prototype.resetForm = function() {
     $('#secretary-notifications').prop('disabled', true);
     $('#secretary-providers input[type="checkbox"]').prop('checked', false);
     $('#secretary-providers input[type="checkbox"]').prop('disabled', true);
+    $('#secretaries .required').css('border', '');
+    $('#secretary-password, #secretary-password-confirm').css('border', '');
 };
 
 /**