1. A computer-implemented method of inferring whether at least a first relationship exists between at least first and second entities, said method comprising the steps of: applying a first assessor to obtain a first confidence level pertaining to putative existence of said at least first relationship between said at least first and second entities; applying a second assessor to obtain a second confidence level pertaining to putative existence of said at least first relationship between said at least first and second entities; applying a plurality of additional assessors to obtain a plurality of additional confidence levels pertaining to putative existence of said at least first relationship between said at least first and second entities; and combining said first and second confidence levels and said plurality of additional confidence levels to obtain an overall inference whether said at least first relationship exists between said at least first and second entities, wherein: said entities comprise software artifacts; and said at least first relationship comprises a tests relationship wherein one artifact tests another artifact, and wherein said first assessor comprises one of a create-time assessor, a control flow assessor, a user interaction assessor, and a preceding version assessor.