The Productivity Index (PI) is a macro measure of the total productivity of the development environment. It embraces many factors in software development, including management influence, development methods, tools, techniques, skill and experience of the development team, computer availability and application type complexity. Values from .1 to 40 are adequate to describe the full range of projects. Low values generally are associated with poor environments and tools and complex systems. High values are associated with good environments, tools and management and well-understood, straightforward projects.