diff --git a/classes/answer.class.php b/classes/answer.class.php
new file mode 100644
index 0000000..8e33e01
--- /dev/null
+++ b/classes/answer.class.php
@@ -0,0 +1,52 @@
+<?php
+namespace TestProject;
+
+/*
+ * Answer class
+ */
+ class Answer extends Item {
+	private const tb_str = 'answer';
+
+	private $text_str;
+	private $correct_bln;
+
+	/**
+	 * Load answer
+	 *
+	 * @param int $id_int ID of answer to load
+	 */
+	public function __construct( int $id_int ){
+		$db = DB::getDB();
+
+		$rows_arr = $db->select( self::tb_str, array(), array( 'id' => $id_int ) );
+
+		if ( empty( $rows_arr ) ){
+			throw new \RuntimeException( 'Invalid answer ID' );
+		}
+
+		$this->id_int      = $rows_arr[0]['id'];
+		$this->text_str    = $rows_arr[0]['text'];
+		$this->correct_bln = (bool) $rows_arr[0]['correct'];
+	}
+
+	/**
+	 * Get a list of answer IDs for a question
+	 *
+	 * @param int $questID_int ID of question to load answers for
+	 *
+	 * @return int[] Array of answer IDs
+	 */
+	public static function getList( int $questID_int ){
+		$db = DB::getDB();
+
+		$rows_arr = $db->select( self::tb_str, array( 'id' ), array( 'question' => $questID_int ) );
+
+		$id_arr = array();
+		foreach( $rows_arr as $row_arr ){
+			$id_arr[] = $row_arr['id'];
+		}
+
+		return $id_arr;
+	}
+
+}
diff --git a/classes/db.class.php b/classes/db.class.php
index dc0be37..ef6dfbd 100644
--- a/classes/db.class.php
+++ b/classes/db.class.php
@@ -46,7 +46,7 @@ class DB {
 		if ( empty( $fields_arr ) ){
 			$fields_str = '*';
 		} else {
-			foreach( $field_arr as &$field_str ){
+			foreach( $fields_arr as $field_str ){
 				$field_str = '`' . $field_str . '`';
 			}
 			$fields_str = implode( ', ', $fields_arr );
@@ -103,10 +103,10 @@ class DB {
 
 			$fields_str .= '`' . $field_str . '`';
 
-			$var_arr[] = $value;
+			$val_arr[] = $value;
 		}
 
-		$sql_str = 'INSERT INTO `' . $table_str . '` (' . $fields_str . ') VALUES (' . implode( ', ', array_fill( 0, count( $var_arr ), '?' ) ) . ')';
+		$sql_str = 'INSERT INTO `' . $table_str . '` (' . $fields_str . ') VALUES (' . implode( ', ', array_fill( 0, count( $val_arr ), '?' ) ) . ')';
 
 		$stmt = $this->conn->prepare( $sql_str );
 		return $stmt->execute( $val_arr );
diff --git a/classes/item.class.php b/classes/item.class.php
new file mode 100644
index 0000000..2664a10
--- /dev/null
+++ b/classes/item.class.php
@@ -0,0 +1,18 @@
+<?php
+namespace TestProject;
+
+/**
+ * Item class
+ */
+class Item {
+	protected $id_int;
+
+	/**
+	 * Get ID of Item
+	 *
+	 * @return int ID
+	 */
+	public function getID(){
+		return $this->id_int;
+	}
+}
diff --git a/classes/question.class.php b/classes/question.class.php
new file mode 100644
index 0000000..bbf4ed9
--- /dev/null
+++ b/classes/question.class.php
@@ -0,0 +1,76 @@
+<?php
+namespace TestProject;
+
+/*
+ * Question class
+ */
+class Question extends Item {
+	private const tb_str      = 'question';
+	private const resulTb_str = 'question_result';
+
+	private $text_str;
+	private $answers_arr;
+
+	/**
+	 * Load question
+	 *
+	 * @param int $id_int ID of question to load
+	 */
+	public function __construct( int $id_int ){
+		$db = DB::getDB();
+
+		$rows_arr = $db->select( self::tb_str, array(), array( 'id' => $id_int ) );
+
+		if ( empty( $rows_arr ) ){
+			throw new \RuntimeException( 'Invalid question ID' );
+		}
+
+		$this->id_int   = $rows_arr[0]['id'];
+		$this->text_str = $rows_arr[0]['text'];
+
+		$answerID_arr = Answer::getList( $this->id_int );
+		$this->answers_arr = array();
+
+		foreach( $answerID_arr as $answerID_int ){
+			$this->answers_arr[] = new Answer( $answerID_int );
+		}
+	}
+
+	/**
+	 * Get a list of question IDs for a quiz
+	 *
+	 * @param int $quizID_int ID of quiz to load questions for
+	 *
+	 * @return int[] Array of question IDs
+	 */
+	public static function getList( int $quizID_int ){
+		$db = DB::getDB();
+
+		$rows_arr = $db->select( self::tb_str, array( 'id' ), array( 'quiz' => $quizID_int ) );
+
+		$id_arr = array();
+		foreach( $rows_arr as $row_arr ){
+			$id_arr[] = $row_arr['id'];
+		}
+
+		return $id_arr;
+	}
+
+	/**
+	 * Get question text
+	 *
+	 * @return string Question text
+	 */
+	public function getText(){
+		return $this->text_str;
+	}
+
+	/**
+	 * Get Answers for question
+	 *
+	 * @return TestProject\Answer[] Array of answer objects
+	 */
+	public function getAnswers(){
+		return $this->answers_arr;
+	}
+}
diff --git a/classes/quiz.class.php b/classes/quiz.class.php
index 44971e0..fe20274 100644
--- a/classes/quiz.class.php
+++ b/classes/quiz.class.php
@@ -4,13 +4,13 @@ namespace TestProject;
 /*
  * Quiz class
  */
-class Quiz {
+class Quiz extends Item {
 	private const tb_str      = 'quiz';
 	private const resulTb_str = 'quiz_result';
 
-	private $id_int;
 	private $name_str;
 	private $maxScore_int;
+	private $questionID_arr;
 
 	/**
 	 * Load quiz
@@ -28,6 +28,8 @@ class Quiz {
 		$this->id_int       = $rows_arr[0]['id'];
 		$this->name_str     = $rows_arr[0]['name'];
 		$this->maxScore_int = $rows_arr[0]['max_score'];
+
+		$this->questionID_arr = Question::getList( $this->id_int );
 	}
 
 	/**
diff --git a/classes/user.class.php b/classes/user.class.php
new file mode 100644
index 0000000..7d7e387
--- /dev/null
+++ b/classes/user.class.php
@@ -0,0 +1,108 @@
+<?php
+namespace TestProject;
+
+/*
+ * User class
+ */
+class User extends Item {
+	private const tb_str = 'user';
+
+	private $name_str;
+	private $email_str;
+
+	/**
+	 * Load user
+	 *
+	 * @param int $id_int ID of user to load
+	 */
+	public function __construct( int $id_int ){
+		$db = DB::getDB();
+
+		$rows_arr = $db->select( self::tb_str, array(), array( 'id' => $id_int ) );
+
+		if ( empty( $rows_arr ) ){
+			throw new \RuntimeException( 'Invalid user ID' );
+		}
+
+		$this->id_int    = $rows_arr[0]['id'];
+		$this->name_str  = $rows_arr[0]['name'];
+		$this->email_str = $rows_arr[0]['email'];
+	}
+
+	/**
+	 * Find user by email and optionally update name
+	 *
+	 * @param string $email_str Email to search by
+	 * @param string $name_str Name of user to update if needed
+	 *
+	 * @return TestProject\User User object found or created
+	 */
+	public static function find( string $email_str, string $name_str = '' ){
+		$db = DB::getDB();
+
+		$rows_arr = $db->select( self::tb_str, array( 'id' ), array( 'email' => $email_str ) );
+
+		if ( empty( $rows_arr ) ){
+			$id_int = self::create( $email_str, $name_str );
+		} else {
+			$id_int = $rows_arr[0]['id'];
+		}
+
+		$user = new User( $id_int );
+
+		if ( ! empty( $name_str ) && $user->getName() != $name_str ){
+			$user->updateName( $name_str );
+		}
+
+		return $user;
+	}
+
+	/**
+	 * Create a new user
+	 *
+	 * @param string $email_str Email of user
+	 * @param string $name_str Name of user
+	 *
+	 * @return int ID of new user
+	 */
+	private static function create( string $email_str, string $name_str ){
+		$db = DB::getDB();
+
+		$db->insert( self::tb_str, array( 'email' => $email_str, 'name' => $name_str ) );
+
+		$rows_arr = $db->select( self::tb_str, array( 'id' ), array( 'email' => $email_str ) );
+
+		return $rows_arr [0]['id'];
+	}
+
+	/**
+	 * Update name of user
+	 *
+	 * @param string $name New name
+	 */
+	private function updateName( string $name_str ){
+		$db = DB::getDB();
+
+		$db->update( self::tb_str, array( 'name' => $name_str ), array( 'id' => $this->id_int ) );
+
+		$this->name_str = $name_str;
+	}
+
+	/**
+	 * Get name of User
+	 *
+	 * @return string Name
+	 */
+	public function getName(){
+		return $this->name_str;
+	}
+
+	/**
+	 * Get email of User
+	 *
+	 * @return string Email
+	 */
+	public function getEmail(){
+		return $this->email_str;
+	}
+}
diff --git a/init.php b/init.php
index 528ccdd..4a63920 100644
--- a/init.php
+++ b/init.php
@@ -1,6 +1,8 @@
 <?php
+session_start();
 require_once 'config.php';
 
 spl_autoload_register( function( $class_name ){
+	$class_name = str_replace( 'TestProject\\', 'classes/', $class_name );
 	include strtolower( $class_name ) . '.class.php';
 } );