JSD Version 2 and an overview of developments in JSD

This paper provides a brief description of the JSD (Jackson System Development) method as it was originally published by M.A. Jackson (1983), followed by a description of the enhancements introduced over the years which were included in Version 2 of the method published by Learmonth and Birchett Management Systems (1992), and finally it covers some of the recent optional extensions to the `core´ JSD method