What type of relationship does a variability constraint illustrate?

A variability constraint illustrates a relationship involving a variant and its variations. This concept is fundamental in systems engineering, particularly when dealing with product lines or systems that have multiple configurations and options. In this context, a variant refers to a specific version of a product or system, while the variations represent the different attributes or features that can be adjusted or modified within that variant.

By defining variability constraints, engineers can manage and understand how changes or differences in one aspect of a variant may affect other aspects or features. This is crucial for ensuring that all potential configurations meet the necessary requirements and constraints, allowing for efficient design and development processes. Additionally, this approach helps in optimizing designs and ensuring that all variations remain consistent with the overarching system or product goals.