Description:In this we define what variables we have control of and what impact this has on the many variables that we can’t directly control. This then covers the measurements that should be taken and the great care in choosing the right variables to measure. This data is then used in two ways,
* Historical- what was measured in the past and how can the company gain the best information.
* Planned Trials- what is available to let the company carry out a multi variable experiment and gain the best advantage for future production.