List 3 reasons why it is not possible to define a simple analytical scheme that can be applied to all types of evidence?

It is impractical to characterize a basic explanatory plan that can be connected to a wide range of proof since 
(1) each sort of confirmation clearly requires distinctive tests;(2) each test has an alternate level of specificity, and (3) the specialist has practically zero control over the quality and amount of the examples got.

Answerrecruiting and selecting people;