Throughout his career, Barry Boehm has advocated the importance of understanding software development processes, measuring their performance, and using those measurements to guide the development of improved process models. In this paper, we describe PIE, a Process Improvement Environment, which supports that vision. PIE supports the definition of process models that can be analyzed and executed. The analysis is used to detect errors and vulnerabilities in the process models. Validated process models can then be simulated to detect inefficiencies and bottlenecks. Future work includes executing these process models, monitoring their performance, and then using that information to drive further process improvements.