Seasonal Quality Variance
Winter defect rate: 1.5%. Summer defect rate: 4.5-5%. This seasonal variance was observed but attributed vaguely to 'summer issues'—no systematic understanding existed.
What Became Visible
Detailed seasonal quality + environmental analysis revealed: summer heat affected material properties (solder flow, connector durability), equipment thermal expansion, and air pressure consistency. At 28°C vs 18°C, defect rate increased 3x due to thermal sensitivity.
Thermal Management Strategy
Summer cooling system implemented to maintain facility temperature within optimal range (20-24°C). Environmental control stabilized quality year-round.
How it worked: Environmental stability removed the thermal root cause. Quality became consistent independent of season.
Results
summer and winter
from seasonal elimination
Seasonal quality variance indicates environmental sensitivity. Addressing environmental cause eliminates seasonal performance fluctuation.
Operational Reality
The facility thought it was accepting 'summer quality challenges.' Root-cause analysis revealed a solvable thermal sensitivity problem.