A component based approach to the simulation and development of tactics or procedures was presented at WSC’99. This paper provides an update to the approach, describing the substantial progress made in developing a modelling tool set called the Rapid Modelling System (RMS) to take advantage of the original concept. The paper describes the problems encountered during the development and the methods employed to overcome them, whilst keeping to the overall aim of providing a generic structure to the RMS. The current functionality is described including the ability to use propagation data and target strength values for sensor performance. An illustrative example of a tactical set of procedures is described and a worked example is provided showing how the RMS allows variations to be made in a controlled and repeatable manner. The RMS is written in EXTEND TM (Imagine That Inc). 1 AIM OF THE DEVELOPMENT The aim of this development was to create a desktop tool that could be used by analysts to investigate tactics in an intuitive way.