Why would interpart links be used in design?

Interpart links are used in design primarily to ensure that mating parts share the correct interface. By creating these links, you establish relationships between different components, which can help maintain the intended assembly constraints and spatial relationships as changes are made to individual parts. This ensures that the interfaces between parts align correctly, preserving the functional requirements of the design. As a result, when one part is modified, the linked parts can automatically update to reflect those changes, maintaining the integrity of the assembly.

The other choices focus on various aspects of design management and communication but do not capture the primary purpose of interpart links as effectively as the selected response. For example, locking a design from unnecessary changes is more about controlling the editing environment rather than the direct relationship between parts. Adding complex design intent refers to additional features or rules that apply to a part, but interpart links specifically address interaction between multiple parts. Enhancing understandability for other users is important but doesn't align with the primary functional role of interpart links in ensuring correct assembly interfaces.