The prevailing idea being the search for goodness of fit between form and its context, Alexander postulated that in today's selfconscious design process, in order to attain a good design there must be an underlying correspondence between the structure of the problem and the structure of the solution. Good design starts by writing down the requirements, analyzing their interation on the basis of potential misfits in a program, and producing a hierarchical decomposition of the whole in sets of requirements. The synthesis of the form starts then by piecing together the proposal, whose structural hierarchy is the exact counterpart of the functional hierarchy established during the analysis of the program. This process produces diagrams of entities in each step of the composition process. A diagramatic solution of the problem is generated at the end, which is a synthesis of diagrams of specific entities.