There are two fundamental approaches to the problem of legal interpretation, one concentrating on the use of abstract concepts and their analysis by pure logic, and the second concentrating on policy considerations which underlie legal rules and the function they are to serve.
It cannot be denied that the “conceptual” method appears, at first glance, more “scientific” and precise as compared with the “functional” method, but in real fact it does not always ensure certainty and predictability. In many cases, the use of vague general concepts may lead to unexpected results, because the actual construction given to these concepts by the courts may vary according to the concrete facts involved (e.g. the concept of “proximity” in the law of attempt).
But even if, generally speaking, the “conceptual” method achieves a higher standard of certainty than the other method mentioned, one cannot overlook the fact that in some cases the use of the “conceptual” method may lead to injustice, or at least to a failure to achieve the social aims the legislator had in mind.
The importance of certainty and predictability, especially in criminal matters, is beyond dispute, but the weight given to this value in relation to other social values may differ from society to society and from time to time.