This paper extends a particular capacity planning approach to include usage accounting by business element of Input/output path and Direct Access Storage Device resources. A simple nonlinear procedure is outlined to size host configurations that can process workloads at specified rates. An important feature of the procedure is to take account of a law of diminishing returns, which is that doubling the number of components does not double the amount of work done. Discussed are configuration relationships involving TSO and DB/DC subsystem sizing, tuning, workload variability, data considerations, and hardware and software considerations. Typical, but hypothetical, examples are presented.