Faced with a particular customer problem, the laboratory must first set the analytical requirement which defines a method that solves that problem. The main requirements are the following
- Scope - determination of a parameter (concentration of an analyte) in matrices,,,
- Measuring interval - also called range
- Precision - we often focus on a requirement on within-lab reproducibility s(Rw)
- Trueness - expressed as a requirement on maximum bias
- Measurement uncertainty
General requirement and specific for the environmental sector can be found here.