Final answer:
The dimension of requirement classification critical for a tolerant design is whether the requirement is functional or non-functional. Non-functional requirements often act as constraints for tolerance, while both constraints and criteria are used to evaluate the suitability of a design.
Step-by-step explanation:
In the context of requirement classification for a tolerant design, the dimension that is critical for consideration is A. Whether the requirement is functional or non-functional. Functional requirements define what a system is supposed to do, while non-functional requirements specify how the system performs certain functions, which can include tolerance requirements related to reliability, usability, and performance. Tolerance in design is concerned with how well a system can continue to function in the presence of external disturbances or internal variations.
Constraints are conditions that must be satisfied by a design, such as a requirement for a system to operate within certain temperature ranges. On the other hand, criteria are measurable values used to evaluate and compare different designs to determine which best meets the design needs. When considering tolerant design, the focus should be on non-functional requirements acting as constraints that ensure the system can withstand and function under specific conditions. Identifying the right constraints and criteria is essential to evaluate solutions for their ability to meet the demands of a tolerant design.