The mobile app, Walk N' Talk, is for use in those down moments throughout an otherwise busy day, such as walking between meetings or classes, which automatically updates the availability status of each of a user’s close contacts based on variable such as time, location and Google calendar so that he/she knows whether or not it’s a good time to call. The App was the product of a semester of work for the class Engineering Sciences 21: The Innovator's Practice at Harvard University.