Abstract
Designing for the sickest and frailest cancer pa- tients requires an even higher level of user involvement than traditional software development. This paper reports on design and evaluation of a pain assessment tool, where changes of the deployment platform from paper, via laptop to iPad affect the interaction with the tool. We also show how changes of medium affect the readability of the output for health care workers. We found that using the iPad platform and an iterative user centered development process produced the most suitable pain assessment tool for this patient group.