Enter a brief description of your changes
(Required)
Minor changes are by default collapsed in the page history.
No changes
The page does not exist yet.
Failed to load changes
Version by on
Leave Collaboration
Are you sure you want to leave the realtime collaboration and continue editing alone? The changes you save while editing alone will lead to merge conflicts with the changes auto-saved by the realtime editing session.
On the Development of Reactive Systems
David Harel, Amir Pnueli
Krzysztof R. Apt (eds.)
Logics and Models of Concurrent Systems, pages 477–498
NATO ASI Series 13
Springer
1985
Some observations are made concerning the process of developing complex systems. A broad class of systems, termed reactive, is singled out as being particularly problematic when it comes to finding satisfactory methods for behavioral description. In this paper we recommend the recently proposed statechart method for this purpose. Moreover, it is observed that most reactive systems cannot be developed in a linear stepwise fashion, but, rather, give rise to a two-dimensional development process, featuring behavioral aspects in the one dimension and implementational ones in the other. Concurrency may occur in both dimensions, as orthogonality of states in the one and as parallelism of subsystems in the other. A preliminary approach to working one's way through this “magic square” of system development is then presented. The ideas described herein seem to be relevant to a wide variety of application areas.
