The following example is taken from UK Drinking Water Inspectorate guidelines [8].

A laboratory using an analytical method which is not referenced to a fully validated authoritative method will be expected to demonstrate that the method has been fully documented and tested to the standard currently expected of an authoritative reference method. It should demonstrate that the following have been established:

a. the required tolerances of all measurements undertaken within the method (volume,
temperatures, masses etc.);
b. the forms of the determinand measured, including speciation;
c. the effect of interferences has been widely investigated and quantified;
d. significant sources of error have been identified and adequate means of controlling them
have been identified.