What is the test for credibility of testimony in a civil case?

Issues of credibility are primarily for the trial court, and its determination is entitled to great weight (People v. Miret-Gonzalez, 159 AD2d 647). If testimony has all appearances of having been patently tailored to nullify constitutional objections, it is to be discredited. Similarly, testimony which is physically impossible, contrary to experience, or self-contradictory, is to be disregarded as being without evidentiary value (People v. Miret-Gonzalez, supra at 649).