In efforts to assist people who have had a concussion (mild traumatic brain injury), the Parkwood Pacing and Planning™ app has been developed and tested and will be released to the public. The app uses a point system where users have a daily point maximum assigned based on symptom severity with daily activities (recorded by the users). Users can then schedule their daily activities based on their allowed points. The goal is to help users with symptom self-management by facilitating activity planning and pacing. Patients and clinicians have provided positive feedback on the initial version of the app. Using this as a foundation, the investigators envision enhancing the app to provide a more personalized user experience and to enable further discovery and innovations in the recovery from concussion. This will be accomplished through data analytics and machine-learning techniques, informed by the results of a large-scale research trial. This strategy will be used to customize the point system to facilitate the user with pacing and planning.