Connecticut Code of Evidence §4-2 provides that "[e]vidence that is not relevant is inadmissible" and, here, the issue presented by the court's refusal to permit the plaintiff from calling her child as a rebuttal witness to read for the court, was not one of due process but of relevance, where the question for the court to determine was which of two schools could better address the child's educational needs and the proffered evidence was found not probative of the central issue in the case.