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; and combining said first and second 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, or an implements relationship, wherein the one artifact implements the other artifact.