“… 68 , 81 , 82 , 83 , 84 The Transtheoretical Model (TTM) of Behaviour Change, 85 which presents behaviour change through stages describing the individual's status along a continuum from pre-contemplation to action and maintenance, was instead applied by four studies. 86 , 87 , 88 , 89 As for other factors adopted during the development process, 21 studies (36.8%) incorporated the inputs of relevant stakeholders, primarily patients and healthcare professionals, into a user-centred design process based on iterative methods such as usability testing procedures, thereby leading to the final version of the app adopted during the trial.…”