This paper reports on work done in extending an object-oriented co-design method to include analogue hardware. This method is based on the development of a set of dynamic simulation models. These models support the development of the system by providing, initially, an uncommitted, behavioural model, which has evolved into a committed model that specifies the implementation of this system. During the commitment process, parts of the uncommitted logical model are committed to a particular implementation technology. Thus the notation used, and the simulation strategy, must support the evaluation of subsystems implemented as software, digital or analogue hardware. This paper focuses on the requirements for modeling hardware a hybrid system model; i.e.
• A notation that supports the representation evaluation of analogue hardware.
• The simulation strategy required to incorporate models of analogue subsystems.
• The ability to carry forward information contained in the models to implementation.
This presents a small, yet pertinent, example of such a model. This is a wholly analogue model of a Carver-Mead type neural system.