3.03 EXPLANATORY: CREDIBILITY OF WITNESSES is an area of the law that deals with the evaluation of the factual accuracy of testimony provided by a witness in a court of law. It is a legal concept that determines the credibility, or believability, of a witness's testimony. Credibility of witnesses is assessed on the basis of their character, memory, knowledge, and demeanor. There are two main types of 3.03 EXPLANATORY: CREDIBILITY OF WITNESSES: direct and circumstantial. Direct evidence is evidence that directly proves or disproves a fact without the need for any inference. Circumstantial evidence is evidence that requires an inference to be drawn in order to prove or disprove a fact. In the United States, the Federal Rules of Evidence provide guidance on the evaluation of credibility of witnesses. The rules provide that the court may consider the witness's character, bias, prejudice, interest in the outcome of the case, and any other factor that may affect the witness's credibility.