A measurable concept is an abstract relationship between attributes of entities and information needs. For example, an Information Need may be the need to compare the development productivity of a project group against a target rate. The Measurable Concept in this case is “development productivity rate”. To evaluate the concept might require measuring the size of the system or software products and the amount of resource applied to create the products (depending on the chosen model of productivity). Additional examples of Measurable Concepts include quality, risk, performance, capability, maturity, and customer value.