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.

- Walter A. Shewhart

Every sentence in order to have definite scientific meaning must be practically or at least theoretically verifiable as either true or false upon the…

- Walter A. Shewhart

Postulate 3. Assignable causes of variation may be found and eliminated.

- Walter A. Shewhart

Postulate 2. Constant systems of chance causes do exist in nature.

- Walter A. Shewhart

Rule 1. Original data should be presented in a way that will preserve the evidence in the original data for all the predictions assumed to be useful.

- Walter A. Shewhart

Both pure and applied science have gradually pushed further and further the requirements for accuracy and precision. However, applied science, partic…

- Walter A. Shewhart