diff --git a/application/models/Admins_model.php b/application/models/Admins_model.php
index 8d3e2739..033ed6cc 100644
--- a/application/models/Admins_model.php
+++ b/application/models/Admins_model.php
@@ -156,7 +156,7 @@ class Admins_model extends EA_Model {
     {
         $num_rows = $this->db->get_where('user_settings',
             ['username' => $username, 'id_users <> ' => $user_id])->num_rows();
-        return ($num_rows > 0) ? FALSE : TRUE;
+        return $num_rows > 0 ? FALSE : TRUE;
     }
 
     /**
diff --git a/application/models/Appointments_model.php b/application/models/Appointments_model.php
index 7d6a2e13..d7fbcb88 100644
--- a/application/models/Appointments_model.php
+++ b/application/models/Appointments_model.php
@@ -232,7 +232,7 @@ class Appointments_model extends EA_Model {
         ])
             ->num_rows();
 
-        return ($num_rows > 0) ? TRUE : FALSE;
+        return $num_rows > 0;
     }
 
     /**
@@ -381,6 +381,7 @@ class Appointments_model extends EA_Model {
      * @param bool $aggregates (OPTIONAL) Defines whether to add aggregations or not.
      *
      * @return array Returns the rows from the database.
+     * @throws Exception
      */
     public function get_batch($where = NULL, $order_by = NULL, $limit = NULL, $offset = NULL, $aggregates = FALSE)
     {
diff --git a/application/models/Customers_model.php b/application/models/Customers_model.php
index 7a5a03bb..51a7bccf 100644
--- a/application/models/Customers_model.php
+++ b/application/models/Customers_model.php
@@ -158,7 +158,7 @@ class Customers_model extends EA_Model {
             ->where('roles.slug', DB_SLUG_CUSTOMER)
             ->get()->num_rows();
 
-        return ($num_rows > 0) ? TRUE : FALSE;
+        return $num_rows > 0;
     }
 
     /**
diff --git a/application/models/Providers_model.php b/application/models/Providers_model.php
index 6d703363..dfd4bb3f 100755
--- a/application/models/Providers_model.php
+++ b/application/models/Providers_model.php
@@ -187,7 +187,7 @@ class Providers_model extends EA_Model {
     {
         $num_rows = $this->db->get_where('user_settings',
             ['username' => $username, 'id_users <> ' => $user_id])->num_rows();
-        return ($num_rows > 0) ? FALSE : TRUE;
+        return $num_rows > 0 ? FALSE : TRUE;
     }
 
     /**
@@ -215,7 +215,7 @@ class Providers_model extends EA_Model {
             ->where('roles.slug', DB_SLUG_PROVIDER)
             ->get()->num_rows();
 
-        return ($num_rows > 0) ? TRUE : FALSE;
+        return $num_rows > 0;
     }
 
     /**
@@ -348,6 +348,8 @@ class Providers_model extends EA_Model {
      * @param string $setting_name The setting's name.
      * @param string $value The setting's value.
      * @param int $provider_id The selected provider id.
+     *
+     * @return bool
      */
     public function set_setting($setting_name, $value, $provider_id)
     {
@@ -429,7 +431,7 @@ class Providers_model extends EA_Model {
     /**
      * Delete an existing provider record from the database.
      *
-     * @param int $customer_id The record id to be deleted.
+     * @param $provider_id
      *
      * @return bool Returns the delete operation result.
      *
diff --git a/application/models/Secretaries_model.php b/application/models/Secretaries_model.php
index 6446b9ec..a7af7f46 100644
--- a/application/models/Secretaries_model.php
+++ b/application/models/Secretaries_model.php
@@ -165,7 +165,7 @@ class Secretaries_model extends EA_Model {
     {
         $num_rows = $this->db->get_where('user_settings',
             ['username' => $username, 'id_users <> ' => $user_id])->num_rows();
-        return ($num_rows > 0) ? FALSE : TRUE;
+        return $num_rows > 0 ? FALSE : TRUE;
     }
 
     /**
@@ -193,7 +193,7 @@ class Secretaries_model extends EA_Model {
             ->where('roles.slug', DB_SLUG_SECRETARY)
             ->get()->num_rows();
 
-        return ($num_rows > 0) ? TRUE : FALSE;
+        return $num_rows > 0;
     }
 
     /**
@@ -344,6 +344,8 @@ class Secretaries_model extends EA_Model {
      * @param string $setting_name The setting's name.
      * @param string $value The setting's value.
      * @param int $secretary_id The selected provider id.
+     *
+     * @return bool
      */
     public function set_setting($setting_name, $value, $secretary_id)
     {
diff --git a/application/models/Services_model.php b/application/models/Services_model.php
index dcbb1c4a..e41a2e9f 100644
--- a/application/models/Services_model.php
+++ b/application/models/Services_model.php
@@ -186,17 +186,19 @@ class Services_model extends EA_Model {
             'price' => $service['price']
         ])->num_rows();
 
-        return ($num_rows > 0) ? TRUE : FALSE;
+        return $num_rows > 0;
     }
 
     /**
      * Get the record id of an existing record.
      *
-     * NOTICE: The record must exist, otherwise an exception will be raised.
+     * Notice: The record must exist, otherwise an exception will be raised.
      *
      * @param array $service Contains the service record data. Name, duration and price values are mandatory for this
      * method to complete.
      *
+     * @return int
+     *
      * @throws Exception If required fields are missing.
      * @throws Exception If requested service was not found.
      */
@@ -312,12 +314,14 @@ class Services_model extends EA_Model {
     /**
      * Get all, or specific records from service's table.
      *
-     * @param string $whereClause (OPTIONAL) The WHERE clause of
-     * the query to be executed. DO NOT INCLUDE 'WHERE' KEYWORD.
-     *
-     * @return array Returns the rows from the database.
      * @example $this->Model->getBatch('id = ' . $recordId);
      *
+     * @param mixed $where
+     * @param mixed $order_by
+     * @param int|null $limit
+     * @param int|null $offset
+     *
+     * @return array Returns the rows from the database.
      */
     public function get_batch($where = NULL, $order_by = NULL, $limit = NULL, $offset = NULL)
     {
@@ -475,6 +479,11 @@ class Services_model extends EA_Model {
     /**
      * Get all service category records from database.
      *
+     * @param mixed $where
+     * @param mixed $order_by
+     * @param int|null $limit
+     * @param int|null $offset
+     *
      * @return array Returns an array that contains all the service category records.
      */
     public function get_all_categories($where = NULL, $order_by = NULL, $limit = NULL, $offset = NULL)