Use hard numbers shows high reliability, essentially independent of subjective effects, as long as the mathematical models and statistics do not change, requests for examination or anyway, the results are compelling.
Use hard targets instructions reliability, largely unaffected by subjective effects of mathematical models and statistical data as long as there is no change in assessment or request anyway, there are convincing results.
The use of rigid index shows high reliability, basically not influenced by subjective factors, as long as the mathematical model and the statistical data has not changed, in any case assessment or requirements, the results are convincing.