Minimising errors. Planning for reliability
Often there are several tests in a planned trial, for example a factorial trial, in which case the measurements on different test objects and possible repeated measurements of a particular object must be performed in such a way that the effects of measurement error and variations in the studied object can be minimised as well as estimated reliably.
A particular challenge is to separate reliably the sought, intrinsic entity variation from apparent variations arising from limited measurement quality.
Balansing measurement efforts against available resources and demands
Design of experiment also includes the formulation of:
- a realistic specification of the scope of measurements in relation to available resources and demands on process and measurement capabilities
- Optimised uncertainty