RATIONALE "Brown, Routineness Revisited." D.C. Brown, Routineness Revisited. In: Mechanical Design: Theory and Methodology, (Eds) M. Waldron & K. Waldron, Springer-Verlag, 1995. Many of the first systems built by AI in Design researchers were "routine" design systems: mostly "parametric design". This paper examines what that means, providing a theoretical foundation that allows us to know how to recognize and classify systems that act in this way. Knowing what "task" a design system is supposed to achieve allows the right techniques to be used.