Weight of evidence describes the persuasive force the fact‑finder (judge, jury or tribunal) gives to admissible material when determining disputed facts. It is a descriptive expression used across civil and criminal proceedings, recognised in case law rather than defined uniformly by statute.It is distinct from admissibility, the burden of proof and the standard of proof. Once evidence is admitted, the court evaluates its probative value by reference to factors such as reliability, credibility, consistency, corroboration, methodology and reasoning (for expert evidence), contemporaneity, and inherent probabilities. Hearsay, documentary and expert evidence may attract more or less weight depending on these factors. In civil cases, legislation on hearsay (for example, the Civil Evidence Acts in England & Wales and comparable provisions in Scotland, Northern Ireland and Ireland) indicates matters the court considers when deciding the weight to give such evidence.Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland. Practically, weight of evidence governs whether a party meets the standard of proof (balance of probabilities in civil cases; beyond reasonable doubt in criminal cases). On appeal, parties often contend a decision was against the weight of the evidence; appellate courts rarely interfere absent misdirection, error of principle, or a plainly wrong conclusion.