Open Effectivity
An effectivity condition with a defined start but no defined end — meaning the part or configuration is valid from the start condition forward, with no known supersession date.
Why it matters
Open effectivity is appropriate for current, active configurations but becomes a configuration management liability when it accumulates across hundreds of parts in a complex BOM. Every open effectivity should be reviewed and closed when a superseding change is implemented, to maintain clean as-built reconstruction capability.
External References
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Cite this definition
Finocchiaro, Michael. “Open Effectivity.” DemystifyingPLM PLM Glossary, 2026, https://www.demystifyingplm.com/glossary/open-effectivity