Goal-oriented requirements modelling for running systems

Today, software systems are moving towards online deployment as collaborative composite services, the operating environments and users´ needs for which are continuously changing. Thus, it is important to understand how to cope with run-time requirements by dynamic adaption at different levels. This paper aims to summarize our general position and understanding of this problem. In particular, we introduce a typology - a theoretical classification framework of different types of systems, with increasing levels of capability, namely, the static, reactive, adaptive and collaborative systems. The typology is built on a common architecture using rule base to store knowledge for run-time use. The accompanying development method includes a series of steps to allow run-time adaptation, and a goal-oriented modeling method and notation to analyze possible requirements changes at run-time.