Abstract
This paper describes the basic methodology of a formal method (LAST) that uses elements of linear algebra and set theory for IS-specification. It also reports on an R&D project whose aim is to develop LAST and to make it fully operational. To this end, a CASE-tool consisting of a LAST user interface, and a translator LAST-UML will be developed and tested. The necessary description of LAST-UML correspondence is also treated. The ultimate goal of the project is to contribute to the improvement of the IS development cycle.