One Factor at a Time (OFAT)

One Factor at a Time (OFAT) describes the popular but highly inefficient way to conduct an experiment where the process is evaluated from the change one thing, evaluate, change it back and change another and so on. It is deemed to be less effective than the Design of Experiments (DOE) approach because OFAT does not take into account how multiple factors interact with each other and therefore their potential to impact upon the process.

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