In this paper we use the concept of DP contribution to response variation to identify the relationship between DPs and responses. Learning this relationship requires knowledge of DP variability and sensitivity of responses with respect to DP settings. The contributions can be collected in a matrix which may be simplified by treating insignificant contributions as 0. Following the decoupling idea of Axiomatic Design, the relationship matrix can be rearranged to be as triangular as possible. The resulting matrix may not be a design matrix in the strict sense of Axiomatic Design, but it can provide an engineer with a clear strategy for tuning the design to achieve desired functional requirements.