private function update_completion_status( $status, $object_id, $object_type, $trigger = 'unspecified' ) {

		$student_id = $this->get_id();

		/**
		 * Fires before a student's object completion status is updated.
		 *
		 * The dynamic portion of this hook, `$status`, refers to the new completion status of the object,
		 * either "complete" or "incomplete"
		 *
		 * @since Unknown
		 *
		 * @param int    $student_id  WP_User ID of the student.
		 * @param int    $object_id   WP_Post ID of the object.
		 * @param string $object_type The type of object. A lesson, section, course, or course_track.
		 * @param string $trigger     String describing the reason for the status change.
		 */
		do_action( "before_llms_mark_{$status}", $student_id, $object_id, $object_type, $trigger );

		// Retrieve an instance of the objec we're acting on.
		if ( in_array( $object_type, llms_get_completable_post_types(), true ) ) {
			$object = llms_get_post( $object_id );
		} elseif ( in_array( $object_type, llms_get_completable_taxonomies(), true ) ) {
			$object = get_term( $object_id, $object_type );
		} else {
			return false;
		}

		/**
		 * Lessons have binary completion (complete or incomplete).
		 *
		 * Other objects are dependent on their children's statuses. These other object types
		 * must check the combined progress of their children to see if it's complete / incomplete.
		 */
		$complete = ( 'lesson' === $object_type ) ? ( 'complete' === $status ) : ( 100 == $this->get_progress( $object_id, $object_type, false ) );

		// Get parent information.
		$parent_data = array(
			'ids'  => array(),
			'type' => false,
		);

		// Get the immediate parent so we can cascade up and maybe update the parent's status.
		switch ( $object_type ) {

			case 'lesson':
				$parent_data['ids']  = array( $object->get( 'parent_section' ) );
				$parent_data['type'] = 'section';
				break;

			case 'section':
				$parent_data['ids']  = array( $object->get( 'parent_course' ) );
				$parent_data['type'] = 'course';
				break;

			case 'course':
				$parent_data['ids']  = wp_list_pluck( $object->get_tracks(), 'term_id' );
				$parent_data['type'] = 'course_track';
				break;

		}

		/**
		 * Filter the parent data used to cascade object completion up to an object's parent(s).
		 *
		 * @since 4.2.0
		 *
		 * @param array  $parent_data {
		 *     Array of the object's parent information.
		 *
		 *     @type int[]  $ids  Object ids for the parent object(s).
		 *     @type string $type Object type (course, course_track, etc...).
		 * }
		 * @param object $object      The object. An `LLMS_Course`, for example.
		 * @param int    $ojbect_id   The object's ID.
		 * @param string $object_type The object's type.
		 */
		$parent_data = apply_filters( 'llms_mark_complete_parent_data', $parent_data, $object, $object_id, $object_type );

		// Reset the cached progress for any objects with children.
		if ( 'lesson' !== $object_type ) {
			$this->set( sprintf( '%1$s_%2$d_progress', $object_type, $object_id ), '' );
		}

		// Reset cache for all parents.
		if ( $parent_data['ids'] && $parent_data['type'] ) {
			foreach ( $parent_data['ids'] as $pid ) {
				$this->set( sprintf( '%1$s_%2$d_progress', $parent_data['type'], $pid ), '' );
			}
		}

		// Determine if an update should be made.
		$update = ( 'complete' === $status && $complete ) || ( 'incomplete' === $status && ! $complete );

		if ( $update ) {

			// Insert meta data.
			if ( 'complete' === $status ) {
				$this->insert_completion_postmeta( $object_id, $trigger );
			} elseif ( 'incomplete' === $status ) {
				$this->insert_incompletion_postmeta( $object_id, $trigger );
			}

			/**
			 * Hook that fires when a student's completion status is updated for any object.
			 *
			 * The dynamic portion of this hook, `$status`, refers to the new completion status of the object,
			 * either "complete" or "incomplete"
			 *
			 * @since Unknown
			 *
			 * @param int    $student_id  WP_User ID of the student.
			 * @param int    $object_id   WP_Post ID of the object.
			 * @param string $object_type The type of object. A lesson, section, course, or course_track.
			 * @param string $trigger     String describing the reason for the status change.
			 */
			do_action( "llms_mark_{$status}", $student_id, $object_id, $object_type, $trigger );

			/**
			 * Hook that fires when a student's completion status is updated for a specific object type.
			 *
			 * The dynamic portion of this hook, `$object_type` refers to the WP_Post post_type of the object
			 * which the student's completion status is being updated for.
			 *
			 * The dynamic portion of this hook, `$status`, refers to the new completion status of the object,
			 * either "complete" or "incomplete"
			 *
			 * @since Unknown
			 *
			 * @param int $student_id WP_User ID of the student.
			 * @param int $object_id  WP_Post ID of the object.
			 */
			do_action( "lifterlms_{$object_type}_{$status}d", $student_id, $object_id );

			// Cascade up for parents.
			if ( $parent_data['ids'] && $parent_data['type'] ) {
				foreach ( $parent_data['ids'] as $pid ) {
					$this->update_completion_status( $status, $pid, $parent_data['type'], $trigger );
				}
			}

			/**
			 * Hook that fires after a student's completion status for an object and it's parents have
			 * been updated.
			 *
			 * The dynamic portion of this hook, `$status`, refers to the new completion status of the object,
			 * either "complete" or "incomplete"
			 *
			 * @since Unknown
			 *
			 * @param int    $student_id  WP_User ID of the student.
			 * @param int    $object_id   WP_Post ID of the object.
			 * @param string $object_type The type of object. A lesson, section, course, or course_track.
			 * @param string $trigger     String describing the reason for the status change.
			 */
			do_action( "after_llms_mark_{$status}", $student_id, $object_id, $object_type, $trigger );

		}

		return $update;

	}