Final answer:
Configuration management procedures are essential during test planning and are revisited through testing and evaluating to refine the design or choose a new concept as necessary.
Step-by-step explanation:
Configuration management procedures should be implemented when refinining the design. During test planning, these procedures are necessary to establish and maintain consistency of a product's performance, functional, and physical attributes with its requirements, design, and operational information throughout its life. This implementation is crucial because testing and evaluation can reveal weaknesses or potential improvements in the design, making it necessary to refine it in order to better meet criteria and constraints. If testing and evaluation show that a design cannot work, a new design concept must be chosen, and configuration management ensures that this pivot is handled systematically. Therefore, these procedures are integral from the beginning of the testing phase and are revisited as necessary when evaluating exit criteria to ensure the design remains functional and consistent with the project goals throughout its lifecycle.