Abstract: Methods and systems for usage-based product definition are disclosed. In one embodiment, a method includes instancing one or more usage-based product definition inputs, and assessing at least one of an applicability expression, an engineering requirement, and a manufacturing availability expression. The method further includes generating the product definition based on at least some of the usage-based product definition inputs, applicability expressions, engineering requirements, and manufacturing availabilities. In alternate embodiments, the instancing may include transforming a coordinate system of a component from a component-centered coordinate system to a product-centered coordinate system.