Previous Installments:

Part I: Design Your Experiments

Part II: Noise

Part III: Noise characteristics and measurement

Part IV: Propagation of Noise (Error)

Part V:
A Formal Design Method

Part VI:
Regression

Part VII:
Fractional Designs

Part VIII:
Randomization and Other Issues

Part IX:
Regression and Model Building

Part X:
Model Building

Part XI:
Instruments

Part XII:
Calibration

Part XIII:
Other Experiment Designs