MERMoTT, Multimedia Entity - relationship modelling Tutor and Tool, is a Microsoft Windows based Computer Aided Learning (CAL) package aimed at the support of first year undergraduates in their study of Structured Analysis techniques, specifically Entity-relationship modelling. The package grew from a final year undergraduate project proposed by the author as a reaction to his needs as a first year lecturer in Systems Analysis. The paper seeks to show the development of MERMoTT as a possible solution to the problems which can arise from the teaching of abstract graphical notations such as these. The paper outlines the difficulties faced by educators in the field of Systems Analysis and how the package, which is based around the CORE approach, seeks to overcome these.