“Postulate 2. Constant systems of chance causes do exist in nature.” CausesChanceConstant Author:Walter A. Shewhart
“Postulate 1. All chance systems of causes are not alike in the sense that they enable us to predict the future in terms of the past.” PastCausesTermChance Author:Walter A. Shewhart
“Postulate 3. Assignable causes of variation may be found and eliminated.” MayFoundCausesVariation Author:Walter A. Shewhart
