At which stage are documents created that describe how to use and understand the new systems?

The correct answer is Documentation. This stage is crucial in the development life cycle because it involves creating various materials that explain how the new system works. During documentation, user manuals, help guides, and technical documentation are produced to ensure that users can effectively understand and utilize the system. Proper documentation is essential for training users, assisting in troubleshooting, and maintaining the system in the future.

This stage occurs after the functionality has been established and before deployment, ensuring that all aspects of the system are accounted for with clear instructions. Good documentation facilitates a smoother transition to the new system, enabling users to adapt quickly and reducing the potential for confusion or errors after implementation.