Model-based process improvement typically centers on a single model or framework as the lynchpin to control software process improvement within an organization. The use of a model or framework is an excellent means of reducing random activity; unfortunately, one model does not cover the whole organization. Process improvement has matured to a point where the span of control needs to be extended, which suggests the use of more than one model (e.g. CMMI, ISO, ITIL). This presentation discusses how to manage process improvement in a complex, multi-model environment.