Performance monitoring is often where reliability intent meets operational reality and where many well-intentioned reliability programmes quietly lose focus.
Most organisations monitor something, such as failures, availability, response times or costs. The challenge is choosing indicators that genuinely reflect system performance, rather than those that are simply easy to collect or report.
Indicators should be derived from clear reliability and safety objectives, not chosen just because data is available. Good reliability indicators should do three things:
Reflect what really matters
They should relate directly to system function, mission success, safety or operational impact, not abstract technical measures.
Support decisions, not just reporting
If an indicator doesn’t help someone decide what to change, prioritise or investigate, it’s not doing its job. Well-chosen indicators inform resource allocation and trade-offs, not just status updates.
Expose trends and risk early
Useful indicators highlight emerging degradation or risk before they escalate into visible failures or major disruption.
Problems arise when indicators are selected in isolation. A metric can look healthy on a dashboard while masking underlying issues, particularly if it averages variability, excludes inconvenient data or ignores operating context.
Performance monitoring must sit alongside reliability, maintainability, operations and support, not bolted on afterwards. Indicators should reflect how the system is actually used, not how it was assumed to be used.
Effective reliability engineers don’t just accept existing KPIs. They challenge whether those measures still make sense, encourage the right behaviours and align with the risks the organisation is trying to manage.
On many programmes, reliability KPIs focus almost entirely on past performance, failures, downtime or achieved availability. These lagging indicators explain what has happened, but do little to reduce future risk. Without leading indicators, reliability management quickly becomes reactive.
Structured feedback mechanisms such as DRACAS and reliability growth monitoring provide forward visibility, linking failure data to corrective action and measurable improvement.
Performance monitoring isn’t about having more metrics, it’s about having the right ones, understood by those who rely on them and used to prompt action. When indicators are well chosen, they become an early-warning system. When poorly chosen, they create false reassurance – often right up to the point that something fails…
Next up…
Reliability Bites #10: Reliability in projects – timing, trade-offs and influence.
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