Members of the Mobile CSP team traveled to Philadelphia on Sunday, June 28th, to host a workshop at ISTE 2015 (International Society for Technology in Education) on building socially useful apps in App Inventor. The workshop was attended by 30+ teachers, all of whom seemed to go away happy. Mobile Computer Science Principles is a program the follows the College Boards emerging advanced placement course in computer science, where students use App Inventor to build socially useful mobile apps.