PETRA is developed in a multidisciplinary team of researchers, clinicians, patients, and IT-specialists. We use design thinking and the roadmap developed by the Center of E-Health Research of the University of Twente to guide the development of both the decision aid and the feedback module.

For the first phases of the methodology, we have done extensive research into the experiences and wishes of patients and clinicians for an ESM tool (see publications). Combined with scientific knowledge of ESM, this resulted in a list of essential requirements for PETRA and the first prototypes of the tool. These prototypes are currently tested and further developed with patients and clinicians in an iterative process.