Requisite Proof of Basis for Expert Opinion

This article is about the factual foundation of expert opinion evidence. It is tentative, not dogmatic or even confident. It proposes for further consideration by others our effort at more precise shaping of doctrines which have become familiar but remained vague. These doctrines have to do with the degree of stringency which is and ought to be exercised in applying ordinary rules of evidential competency to proof of propositions of fact underlying or related to formulation and announcement of experts' opinions in litigated cases.