Research that focuses on designing mobile technology for individuals who engage in self-injury or suffer from borderline personality disorder together with patients is scarce. In a previous study, a concept for a mobile app that aims to support above mentioned target population was established. Requirements were derived from talking to psychotherapists and psychiatrists. Based on this preliminary work a new project seeks to include the end user perspective and establish a holistic concept for such an app featuring patients´ opinions by applying an iterative user centred design approach. The authors will interview 20 patients in order to explore their thoughts and opinions, thus derive requirements from interview data, which will then be implemented in a prototype of the system. This project contributes opinions and wishes from a `hard-to-reach´ population. Looking into their beliefs adds to understanding what self-harm recovery entails for patients and what mobile technology, if tailored to the expectations of the end users themselves, can do to support the therapy process. Currently, the authors are recruiting patients and aim to establish ethics approval to work with patients at a regional medical institution. The preliminary work together with therapists is also very important and needs to be combined with the wishes of the target group to get an app, which can cover the whole process for the patients. The authors would like to give an oral presentation at the ECRF17 to talk about the concrete ideas for gathering requirements and combining them with already identified ones from the therapists.