How is the functionality and capacity of a system specified?

The functionality and capacity of a system are specified through requirements documentation, which outlines the system's intended operations, features, and performance metrics. Functional specifications detail what the system should do, including user interactions and processing logic, while capacity specifications define the limits of system resources, such as maximum users, data storage, and processing speeds. These specifications serve as a foundation for design, implementation, and testing, ensuring that the system meets user needs and performance expectations.