An Operations and Maintenance Information Open System Alliance

OIIE Use Case - Lockout-Tagout

This use case details the event interactions around the lockout-tagout process in order to improve work safety by ensuring that information is disseminated to involved parties.


Lockout-tagout is a safety procedure to ensure that hazardous machinery and equipment are properly disabled and not started up again prior to the completion of servicing and maintenance work. It is often a regulatory requirement - for example, see the US OSHA standard for The Control of Hazardous Energy.

The lockout-tagout procedure has historically been a largely manual process with paper-based permits and tags, and manual coordination between operation and maintenance teams. The introduction of Integrated Safe System of Work (ISSOW) systems automates some of the process from a permitting and risk management perspective.

Main Success Scenario


  • Are there any differences pre-handover (e.g. commissioning)?
  • Do we want to address LOTO audits? See US OSHA 29 CFR 1910.147(c)(6).
  • Do we need a split during "Lockout Device Application" for devices that can only be tagged out (e.g. decision block for "Can Device be Locked Out?") and recording what was applied?