Principlev1
Assign expiration dates to time-sensitive information at
Assign expiration dates to time-sensitive information at capture rather than assuming all stored information remains valid indefinitely, because knowledge decays at measurable domain-specific rates.
Why This Is a Principle
Derives from Categories Are Human Constructions (categories are constructed for purposes) and Abstraction Necessarily Discards Information (abstraction discards information). The principle prescribes proactive metadata assignment based on the reality that information has context-dependent shelf lives. This prevents treating all information as equally current.