Continual Improvement and Measurement
Improvement as a discipline
Continual improvement is a repeating cycle, not a one-off project. The well-known Plan–Do–Check–Act (PDCA) loop is the backbone: plan the change and its measures, do it on a small scale, check results against the baseline, act to standardize or adjust. Candidates should be able to place any improvement activity into the correct PDCA phase. A common trap is labeling measurement as "Do" - measurement is Check.
Measuring what matters
Know the difference between metrics (quantified measures), KPIs (key indicators tied to objectives), and critical success factors (CSFs) (what must go right to meet objectives). Good measurement covers effectiveness (did we achieve the outcome?) and efficiency (at what cost/resource?). Balance leading indicators (predictive, e.g., trend of open problems) against lagging indicators (results already realized, e.g., last month's availability).
Baselines and the improvement register
You cannot prove improvement without a baseline. Record the current state, define the target, and track the gap. Improvements are typically captured in an improvement register with owner, benefit, and status, then prioritized by value and effort.
Traps to watch
- Confusing efficiency (doing things right, low waste) with effectiveness (doing the right things).
- Tracking activity counts (tickets closed) as if they were outcome measures.
- Skipping the baseline, then being unable to demonstrate benefit.
Rule of thumb
For any proposed metric, ask: "What decision would change if this number moved?" If no decision changes, it is a vanity metric. Pair every efficiency measure with an effectiveness measure so speed never silently degrades quality.