The phrase enterprise environmental factors refers to an input output mechanism that is meant or intended to measure and determine the particular and specific external and/or environmental factors that cause for significant noise and influence surrounding the ultimate success of a particular phase of a project or of the project as a whole. These enterprise environmental factors can range and vary wildly in specific type or nature. They can, and typically do, involve any and all of the particular enterprises that are involved in the project from the outside in (and vice versa). These traditionally can include the structure of the organization its culture, all infrastructural components, commercial databases, market conditions, any resources that may currently exist, and any project management software that the project team may have ready access to should it be needed. Enterprise environmental factors can be quantified in a number if different ways, but of paramount importance is the proper documentation of them.
This term is defined in the 3rd and the 4th edition of the PMBOK.