2. Design of experiments

When intending to make a decision about an entity based on measurement, it is often not only a question of performing just one measurement of a single test object.

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.


– Specifications of Process and Measurement Capabilities

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


Processes of production &  measurement
Specification of measurement problem
Design of experiments
Specification of demands on a measurement system
Choice/development of a measurement method
Evaluation (validation) of a measurement method
Performing the measurements
Presentation of measurement results
Use of measurement results. Conformity assessment


*Contact leslie.pendrill@sp.se for password

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