Guilford's Structure of Intellect model has three dimensions: 1. Operations What the intellect does (e.g., cognition, memory, divergent production, convergent production, evaluation). 2. Content The nature of the information (figural, symbolic, semantic, behavioral). 3. Products The form in which information is stored or processed (units, classes, relations, systems, transformations, implications). 'System' is a type of product, not content.