FW/SM: A Prototype Structured Modeling Environment

A research prototype implementation has been evolving for several years in parallel with the vision, theory, language, and applicative aspects of structured modeling. The objective of this article is to describe the capabilities of this implementation as it now stands, and to comment on how it contributes toward fulfilling a previously published agenda for the development of a new generation of modeling environments. The intended audience is all modeling system designers and evaluators, including those who do not happen to take a structured modeling approach.