This paper explores the process of validation for the syntax of a graphical notation. We define a unified specification for five of the UML diagrams used by the Discovery Method and, in this document, we illustrate how diagrams can be represented in Alloy and checked against our specification in order to know if these are valid under the Discovery notation. Keywords Formal specification, model checking, Alloy, visual modelling, UML
Anthony J. H. Simons, Carlos Alberto Fernán