At http://backbonetutorials.com/organizing-backbone-using-modules/ define([ 'jquery', 'underscore', 'backbone', 'views/projects/list', 'views/users/list' ], function($, _, Backbone, Session, ProjectListView, UserListView){ Is wrong because the Session is not loaded. Also in the same page: http://backbonetutorials.com/organizing-backbone-using-modules/ app_router.on('showProjects', function(){ should be app_router.on('route:showProjects', function(){ see more here: http://stackoverflow.com/questions/14410242/backbone-router-doesnt-work-with-requirejs