Mechatronics requires the integration of a range of technologies, often with conflicting requirements. This problem is particularly complex with respect to the electronic element of a mechatronic system where there are currently no computer-based tools available to support and assist the design team during the early, decision making, stages of the design process. The paper describes a concept study for a computer-based design support tool based on the use of functional modelling and operating in the electronic domain which will enable the electronics designer to rapidly evaluate differing design strategies. Operation of the proposed tool is illustrated by a design case study.