This paper is designed as a reference source, for all three Divisions of the Immigration and Refugee Board, on issues related to weighing evidence. The paper is intended to be a practical tool, and thus includes some possible factors to consider in weighing the evidence, as well as relevant caselaw. The factors are not meant to be exhaustive, nor is their application to be considered mandatory. The factors are provided simply as a guide to the matters that may be relevant in weighing different types of evidence.