This document provides information about FitNesse, a software collaboration and testing tool. It discusses acceptance testing and different types. It then describes what FitNesse is, how it works as a wiki and with different programming languages. The document outlines FitNesse's architecture using wiki pages, a testing engine, test fixtures, and the system under test. It also discusses the FIT and Slim testing engines and how fixtures interface between FitNesse tables and the system being tested.