What type of relationship describes a situation where one requirement can only be implemented if another has been implemented?

The type of relationship that describes a situation where one requirement can only be implemented if another has been implemented is known as a "Depends relationship." This term is used to indicate that the fulfillment of one requirement is contingent upon the completion of another requirement.

In practice, this means that the dependent requirement cannot be realized or fulfilled unless the prerequisite requirement is already in place. This relationship highlights a clear hierarchy and dependency between requirements, which is crucial in project planning and management. Understanding these dependencies is essential for ensuring that the development process flows smoothly and that requirements are prioritized correctly to avoid delays in project timelines.

In contrast, other types of relationships such as synonymous, derivative, and independent relationships do not convey this specific dependency. The synonymous relationship refers to requirements that can be used interchangeably, while the derivative relationship implies one requirement is based on or derived from another, but may not necessarily depend on it being implemented first. An independent relationship indicates that requirements can be developed and implemented without relying on each other, which does not apply in scenarios where one requirement is directly dependent on another.