Table 1.

Requirements for each Development Stage.

Development Stage	Targeted Outcome	Specific Processes	Modifications
Expert Review	Overall workflow of app finalized. Requirements list and features identified.	Research into appropriate cognitive testing methods was carried out alongside mobile workflow and design research. Expert opinion was used for each requirement inclusion.	Sequencing of cognitive tests were discussed and finalized based upon perceived enjoyment and difficulty.
Prototype	Prototype app finalized, based upon requirements set up from Expert Review.	Storyboarding of smartphone app screens to create a structured guide for design. Color scheme and visual design was finalized. Front and backend development finalized to create a stable, secure, and usable app.	Through storyboarding and visual planning, complexity of the cognitive tests was reduced to improve their usability. The Mental Fatigue Scale was adapted for easier use on a smartphone.
Pilot Study	Deployment of the prototype app to a small group of participants in a pilot study. Gather usability feedback from participants.	Carried out a two-week pilot study using the developed app. Participants did not have any prior acquired brain injuries (to validate the app on a healthy population first, as using a vulnerable population is unethical).	Feedback from the pilot study informed the team of usability issues and bugs, and participants suggested improvements to make the app more enjoyable.
Deploy	Deployment of the finalized app to a larger number of participants. Data collection to allow for analysis of results.	Targeted study was used to validate the cognitive fatigue measures that were used within the app.	Targeted study deployment allowed for data collection through participant use of the finalized app. This data was then analyzed to establish the accuracy and validity of proposed cognitive testing methods.