diff --git a/includes/Checker/Check_Result.php b/includes/Checker/Check_Result.php
index 70ca9f55..e501e1eb 100644
--- a/includes/Checker/Check_Result.php
+++ b/includes/Checker/Check_Result.php
@@ -7,11 +7,182 @@
 
 namespace WordPress\Plugin_Check\Checker;
 
+use WordPress\Plugin_Check\Checker\Check_Context;
+
 /**
  * Result for running checks on a plugin.
  *
  * @since n.e.x.t
  */
 class Check_Result {
-	// @TODO: Complete as part of issue #11.
+
+	/**
+	 * Context for the plugin to check.
+	 *
+	 * @since n.e.x.t
+	 * @var Check_Context
+	 */
+	protected $check_context;
+
+	/**
+	 * List of errors.
+	 *
+	 * @since n.e.x.t
+	 * @var array
+	 */
+	protected $errors = array();
+
+	/**
+	 * List of warnings.
+	 *
+	 * @since n.e.x.t
+	 * @var array
+	 */
+	protected $warnings = array();
+
+	/**
+	 * Number of errors.
+	 *
+	 * @since n.e.x.t
+	 * @var int
+	 */
+	protected $error_count = 0;
+
+	/**
+	 * Number of warnings.
+	 *
+	 * @since n.e.x.t
+	 * @var int
+	 */
+	protected $warning_count = 0;
+
+	/**
+	 * Sets the context for the plugin to check.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param Check_Context $check_context Check context instance for the plugin.
+	 */
+	public function __construct( Check_Context $check_context ) {
+		$this->check_context = $check_context;
+	}
+
+	/**
+	 * Returns the context for the plugin to check.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return Check_Context Plugin context instance.
+	 */
+	public function plugin() {
+		return $this->check_context;
+	}
+
+	/**
+	 * Adds an error or warning to the respective stack.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param bool   $error   Whether it is an error message.
+	 * @param string $message The message.
+	 * @param array  $args    {
+	 *     Additional message arguments.
+	 *
+	 *     @type string $code   Violation code according to the message. Default empty string.
+	 *     @type string $file   The file in which the message occurred. Default empty string (unknown file).
+	 *     @type int    $line   The line on which the message occurred. Default 0 (unknown line).
+	 *     @type int    $column The column on which the message occurred. Default 0 (unknown column).
+	 * }
+	 */
+	public function add_message( $error, $message, $args = array() ) {
+		$defaults = array(
+			'code'   => '',
+			'file'   => '',
+			'line'   => 0,
+			'column' => 0,
+		);
+
+		$data = array_merge(
+			array(
+				'message' => $message,
+			),
+			$defaults,
+			array_intersect_key( $args, $defaults )
+		);
+
+		$file   = str_replace( $this->plugin()->path( '/' ), '', $data['file'] );
+		$line   = $data['line'];
+		$column = $data['column'];
+		unset( $data['line'], $data['column'], $data['file'] );
+
+		if ( $error ) {
+			if ( ! isset( $this->errors[ $file ] ) ) {
+				$this->errors[ $file ] = array();
+			}
+			if ( ! isset( $this->errors[ $file ][ $line ] ) ) {
+				$this->errors[ $file ][ $line ] = array();
+			}
+			if ( ! isset( $this->errors[ $file ][ $line ][ $column ] ) ) {
+				$this->errors[ $file ][ $line ][ $column ] = array();
+			}
+			$this->errors[ $file ][ $line ][ $column ][] = $data;
+			$this->error_count++;
+		} else {
+			if ( ! isset( $this->warnings[ $file ] ) ) {
+				$this->warnings[ $file ] = array();
+			}
+			if ( ! isset( $this->warnings[ $file ][ $line ] ) ) {
+				$this->warnings[ $file ][ $line ] = array();
+			}
+			if ( ! isset( $this->warnings[ $file ][ $line ][ $column ] ) ) {
+				$this->warnings[ $file ][ $line ][ $column ] = array();
+			}
+			$this->warnings[ $file ][ $line ][ $column ][] = $data;
+			$this->warning_count++;
+		}
+	}
+
+	/**
+	 * Returns all errors.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return array All errors with their data.
+	 */
+	public function get_errors() {
+		return $this->errors;
+	}
+
+	/**
+	 * Returns all warnings.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return array All warnings with their data.
+	 */
+	public function get_warnings() {
+		return $this->warnings;
+	}
+
+	/**
+	 * Returns the number of errors.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return int Number of errors found.
+	 */
+	public function get_error_count() {
+		return $this->error_count;
+	}
+
+	/**
+	 * Returns the number of warnings.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return int Number of warnings found.
+	 */
+	public function get_warning_count() {
+		return $this->warning_count;
+	}
 }
diff --git a/tests/Checker/Check_Result_Tests.php b/tests/Checker/Check_Result_Tests.php
new file mode 100644
index 00000000..3c3bdb98
--- /dev/null
+++ b/tests/Checker/Check_Result_Tests.php
@@ -0,0 +1,179 @@
+<?php
+/**
+ * Tests for the Check_Result class.
+ *
+ * @package plugin-check
+ */
+
+use WordPress\Plugin_Check\Checker\Check_Context;
+use WordPress\Plugin_Check\Checker\Check_Result;
+
+class Check_Result_Tests extends WP_UnitTestCase {
+	/**
+	 * Check_Result instance.
+	 *
+	 * @var Check_Result
+	 */
+	protected $check_result;
+
+	public function set_up() {
+		parent::set_up();
+
+		$check_context = new Check_Context( 'test-plugin/test-plugin.php' );
+
+		$this->check_result = new Check_Result( $check_context );
+	}
+
+	public function test_plugin() {
+		$this->assertInstanceOf( Check_Context::class, $this->check_result->plugin() );
+
+		// Check the Check_Context has the correct basename.
+		$this->assertSame( 'test-plugin/test-plugin.php', $this->check_result->plugin()->basename() );
+	}
+
+	public function test_add_message_with_warning() {
+		$this->check_result->add_message(
+			false,
+			'Warning message',
+			array(
+				'code'   => 'test_warning',
+				'file'   => 'test-plugin/test-plugin.php',
+				'line'   => 12,
+				'column' => 40,
+			)
+		);
+
+		$warnings = $this->check_result->get_warnings();
+
+		// Tests that warnings contains an error.
+		$this->assertNotEmpty( $warnings );
+
+		// Tests warnings count incremented correctly.
+		$this->assertEquals( 1, $this->check_result->get_warning_count() );
+
+		// Tests no errors were added or error count incrememeted.
+		$this->assertEmpty( $this->check_result->get_errors() );
+		$this->assertEquals( 0, $this->check_result->get_error_count() );
+
+		// Tests the warning exists in the array.
+		$expected = array(
+			'message' => 'Warning message',
+			'code'    => 'test_warning',
+		);
+
+		$this->assertEquals( $expected, $warnings['test-plugin.php'][12][40][0] );
+	}
+
+	public function test_add_message_with_error() {
+		$this->check_result->add_message(
+			true,
+			'Error message',
+			array(
+				'code'   => 'test_error',
+				'file'   => 'test-plugin/test-plugin.php',
+				'line'   => 22,
+				'column' => 30,
+			)
+		);
+
+		$errors = $this->check_result->get_errors();
+
+		// Tests that errors contains an error.
+		$this->assertNotEmpty( $errors );
+
+		// Tests errors count incremented correctly.
+		$this->assertEquals( 1, $this->check_result->get_error_count() );
+
+		// Tests no warnings were added or warnings count incrememeted.
+		$this->assertEmpty( $this->check_result->get_warnings() );
+		$this->assertEquals( 0, $this->check_result->get_warning_count() );
+
+		// Tests the error exists in the array.
+		$expected = array(
+			'message' => 'Error message',
+			'code'    => 'test_error',
+		);
+
+		$this->assertEquals( $expected, $errors['test-plugin.php'][22][30][0] );
+	}
+
+	public function test_get_errors() {
+		$this->assertEmpty( $this->check_result->get_errors() );
+	}
+
+	public function test_get_errors_with_errors() {
+		$this->check_result->add_message(
+			true,
+			'Error message',
+			array(
+				'code'   => 'test_error',
+				'file'   => 'test-plugin/test-plugin.php',
+				'line'   => 22,
+				'column' => 30,
+			)
+		);
+
+		$errors = $this->check_result->get_errors();
+
+		// Tests errors are not empty.
+		$this->assertNotEmpty( $errors );
+
+		// Tests the error exists in the array.
+		$expected = array(
+			'message' => 'Error message',
+			'code'    => 'test_error',
+		);
+
+		$this->assertEquals( $expected, $errors['test-plugin.php'][22][30][0] );
+	}
+
+	public function test_get_warnings() {
+		$this->assertEmpty( $this->check_result->get_warnings() );
+	}
+
+	public function test_get_warnings_with_warnings() {
+		$this->check_result->add_message(
+			false,
+			'Warning message',
+			array(
+				'code'   => 'test_warning',
+				'file'   => 'test-plugin/test-plugin.php',
+				'line'   => 22,
+				'column' => 30,
+			)
+		);
+
+		$warnings = $this->check_result->get_warnings();
+
+		// Tests warnings are not empty.
+		$this->assertNotEmpty( $warnings );
+
+		// Tests the warning exists in the array.
+		$expected = array(
+			'message' => 'Warning message',
+			'code'    => 'test_warning',
+		);
+
+		$this->assertEquals( $expected, $warnings['test-plugin.php'][22][30][0] );
+	}
+
+	public function test_get_warning_count() {
+		$this->assertEquals( 0, $this->check_result->get_warning_count() );
+	}
+
+	public function test_get_warning_count_with_message() {
+		$this->check_result->add_message( false, 'Warning message' );
+
+		$this->assertEquals( 1, $this->check_result->get_warning_count() );
+	}
+
+	public function test_get_error_count() {
+		$this->assertEquals( 0, $this->check_result->get_error_count() );
+	}
+
+	public function test_get_error_count_with_message() {
+		$this->check_result->add_message( true, 'Error message' );
+
+		$this->assertEquals( 1, $this->check_result->get_error_count() );
+	}
+}