Working Mechanics of D.O.E

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Control Factor Ranges And Levels

Choosing a practical and meaningful range for the control factors under study can be the key to the success of an experiment. Narrow ranges may not be sufficient to observe any effect at all, i.e., the study loses sensitivity to the minute level changes, whereas too wide a range with few levels in between may result in poor generalisations through imprecise approximations, as well as being outside the operating window of the process.

 

Interaction Effects

Two control factors are said to interact if the effect of one depends on the level of the other. For example, if two medicines (A & B) improved the patient’s condition when administered separately but caused deterioration when taken together, A and B are said to interact. When designing a D.O.E, potential interactions must be considered. control factors & interaction effects must be allocated properly to the columns of the orthogonal array.