Planning for accessibility at the beginning of any project is critical. This same principle holds true for mobile applications. During the development of their "Places" app, the National Park Service knew from the beginning that the app would need to be accessible in its operation. They also planned for the delivery of automatically triggered audio description at outdoor exhibit panels and significant places on the landscape. What couldn't be planned was how the accessibility features and operation would change the app itself in addition to the perspectives of the programmers and designers working on the project. Our presenters will use the "Places" app to discuss what everyone should think about during the planning and execution of making mobile apps accessible.