Our mobile app poses simple questions to the user, each time he or she unlocks the screen. Each question needs to be read and answered in 1.6 seconds, which, according to a research paper from study conducted by Stanford University, is the maximum amount of time users want to spend unlocking their phone. So, as you unlock your phone between 10 and 30 times/day, the doctor gets all the information he or she wanted needs from the patient. As we can ask multiple questions each day, we need to keep the patient engaged, by making the daily questionnaires as dynamic as possible.