Methods as action knowledge: Exploring the concept of method rationale in method construction, tailoring and use

Systems development methods are used to express and communicate knowledge about systems and software development processes; i.e. methods encapsulate knowledge. Since methods encapsulate knowledge, they also encapsulate rationale. Rationale can in this context be understood as the reasons and arguments for particular method prescriptions. In this paper we show how the combination of two different aspects of method rationale can be used to shed some light on the communication and apprehension of methods in systems development. This is done by way of clarifying how method rationale is present at three different levels of method existence. By mapping existing research on methods onto this model, we conclude the paper by pointing at some research areas that deserve attention and where method rationale could be used as an important analytic tool.