public function userSubmittedItems(Member $user)
    {
        $userInstances = DataList::create(WorkflowInstance::class)
            ->where('"WorkflowStatus" != \'Complete\'')
            ->sort('LastEdited DESC');

        // Restrict the user if they're not an ADMIN.
        if (!Permission::checkMember($user, 'ADMIN')) {
            $userInstances = $userInstances->filter('InitiatorID:ExactMatch', $user->ID);
        }

        return $userInstances;
    }