The Muon Ionization Cooling Experiment (MICE) collaboration has developed the
MICE Analysis User Software (MAUS) to simulate and analyze experimental data. It serves as
the primary codebase for the experiment, providing for offline batch simulation and reconstruction
as well as online data quality checks. The software provides both traditional particle-physics
functionalities such as track reconstruction and particle identification, and accelerator physics
functions, such as calculating transfer matrices and emittances. The code design is object orientated,
but has a top-level structure based on the Map-Reduce model. This allows for parallelization to
support live data reconstruction during data-taking operations. MAUS allows users to develop in either Python or C++ and provides APIs for both. Various software engineering practices from
industry are also used to ensure correct and maintainable code, including style, unit and integration
tests, continuous integration and load testing, code reviews, and distributed version control. The
software framework and the simulation and reconstruction capabilities are described