What is a critical factor in enabling shelf-life extension of items?

Regular testing for usability is essential for the shelf-life extension of items because it ensures that products remain safe and effective for their intended use beyond their stated expiration dates. By regularly assessing the items, it is possible to identify any degradation in quality, efficacy, or safety that may not be immediately apparent. This proactive approach allows for informed decisions about whether an item can continue to be utilized or if it needs to be replaced.

In the context of the DoD Shelf-Life Program, usability testing can inform the need for additional storage time when results demonstrate that an item maintains its performance characteristics. Regularly scheduled evaluations and tests also allow for timely interventions that can prevent the use of compromised items, maintaining safety and operational readiness.

While other factors such as prolonged storage time, external environmental conditions, and proper record-keeping are important in managing shelf life, they do not directly influence the determination of an item's usability in the same active and ongoing way that regular testing does. Regular testing helps in tracking the actual condition of items as they age and ensures that any shelf-life extensions are based on solid evidence rather than assumptions.