A software developer has been hired to write scheduling software for a school district. Which Waterfall phase involves running the scheduling algorithms through some sample student course files to make sure a correct schedule gets built?

The Analysis phase involves gathering requirements and understanding the needs of the stakeholders, which sets the foundation for what the software must accomplish. However, it does not involve executing any algorithms or testing the software, as that step occurs later in the development process.

The Design phase focuses on creating the architecture and specifications for the software based on the requirements identified during the Analysis phase. While it involves planning how the software will function, it does not include the execution of algorithms or validation of the scheduling output, which is reserved for the Testing phase.

Implementation involves the actual coding and development of the software based on the design specifications. While the scheduling algorithms are coded during this phase, it is not until the Testing phase that these algorithms are executed against sample files to ensure they work correctly.