Other than ensuring the competency of the people carrying out maintenance activities, how do you ensure the quality of your maintenance activities?

For example, do you:
• provide checklists as part of maintenance instruction documents
• undertake post-work inspections or audits of maintenance tasks
• get different teams to peer review each other’s work
• use a re-commissioning/start-up procedure after maintenance on particularly high hazard systems
• match-up procurement, stores and waste stream checks to ensure like for like replacements, etc.?