During the construction phase, all of the associated documentation for an application must be created, updated, and/or validated. Before an application will be accepted by the Testing and Certification Office (TCO), how the system is built and deployed must be documented. This includes any environment related configuration (i.e., JNDI entries, data sources), as well as the Bill of Materials which serves as an inventory of the software and materials that are to be delivered and should list the constituent parts of a given version of a product and where the physical parts are stored. All ancillary documentation needed by the system (i.e., user guide) must also be completed before the construction of the system can be considered complete.