The field of ambulatory care nursing is rapidly growing due to rising health care costs and the demographic development. Against this background, the VitaBIT project started in 2007 with the objective of designing an ICT platform for the safe application of mobile information services in ambulatory care nursing. Communication and secure information exchange between all parties involved in the care process are also guaranteed. The article explains the project's current approach to develop a user-oriented solution using the design steps implied by ISO 13407. Even if a technology is developed and formally tested to be highly usable there exists no guarantee that this will lead to acceptance. That is the reason why end users are involved in all the project stages and serve as testers of prototypes in VitaBIT.