The Center for Solutions for ME/CFS at Columbia University, one of our partner CRCs funded by NIH to accomplish ME/CFS research, is designing a mobile device app called “my/MECFS.” The app, which would allow ME/CFS patients to report on their symptoms and on activities and events that might affect symptoms, is currently being designed. To aid in the design of the app to ensure that it provides meaningful information to patients, researchers, and health professionals, and is also easy to use, Columbia is seeking input from people with ME/CFS and knowledgeable health professionals in a new survey. The survey should take 10 minutes or less to complete, and will help determine what features should be a priority for the app.