The common -KADS methodology can be used as a framework for the inclusion of human factors engineering methods into a project development cycle. We compare the Common-KADS approach to the methodological framework of Lim amd Long (11), and argue that in particular the risk-driven model development cycle of Common-KADS makes it more feasible realistic project planning than the approach by Lim and Long. The argument is supported by a detailed account of how human factors engineering methods can be accommodated in the Common-KADS methodology. For this purpose, we briefly introduce the Common-KADS communication model, and describe its role in deep-level evaluation. In particular, we present the transaction plan walkthrough method, which has been defined directly on the basis of the Common-KADS model structure. The usefulness of this method is illustrated by a case example.