EVOP (Evolutionary Operation)
Small-scale DoE on the running process — cautious, repeated factor variation for continuous improvement.
Also known as: Evolutionary Operation, process EVOP
EVOP (Evolutionary Operation, Box, 1957) is a method for running small, systematic changes to process parameters on the live process — without any production stop — and inferring the best setting from the outcome. Characteristic: very small step sizes, high replication, no scrap risk.
- Small factorial — typically 2² or 2³ around the current process setting
- Tight levels — changes stay inside the specification limits; product quality is preserved
- Repeated cycles — after each cycle the centre is moved toward the suspected optimum and a new cycle begins
See also
Used in
Sources
- Box, G. E. P. — Evolutionary Operation: A Method for Increasing Industrial Productivity, Applied Statistics, 6(2), 1957
- Box, G. E. P. & Draper, N. R. — Evolutionary Operation: A Statistical Method for Process Improvement, Wiley, 1969