Worked: Diagnose a Streak Callback
Run a Five Whys diagnosis on a streak callback and choose a process countermeasure.
The same west-facing slider shows streaks after two visits, especially in direct afternoon sun. Five Whys: problem -> why chain -> controllable countermeasure The common trap is stopping at "bad technique" or "bad glass." Both may contain truth, but neither creates a repeatable prevention step by itself. Problem West slider shows visible pull-line streaks after the crew leaves. A useful problem statement names the pane and visible defect without guessing cause. Why 1-2 Why streaks? Solution dried before the final pull. Why dried? The pane was cleaned in direct sun at 2:20 p.m. The first whys move from symptom to…
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