In-depth analysis of non-deterministic aspects of human-machine interaction and update of dedicated functional mock-ups.

Increasing product complexity makes usability matters more and more important to account for in product development processes. For this reason, tools to design and evaluate interaction are studied and developed day by day. Unfortunately, user non-determinism is difficult to manage. When problems occur during interaction, users can react in several, different ways, depending from their behavioral characteristics. The research described in this paper analyzes non-determinism in depth, characterize situations where it can raise and exploits an existing tool to model and manage it as best as possible. © 2014 Springer International Publishing Switzerland