A programmer has been hired to create an inventory system for the books in a library. What is the waterfall phase in which outlining all the functions that need to be written to support the inventory system?

The analysis phase involves gathering and defining the requirements of the system based on user needs and specifications. While it is crucial for determining what the system should accomplish, it does not focus on outlining specific functions or technical details, which is reserved for the design phase.

Testing is the phase where the implemented system is evaluated to identify defects and ensure that it meets the specified requirements. This stage occurs after the design and implementation phases, focusing on verifying that all functions work as intended rather than defining what those functions should be.

Implementation is the phase where the actual coding of the software takes place based on the designs created earlier. While the functions are executed during this phase, the outlining of these functions is already completed in the design phase, making implementation about execution rather than planning.