On the merits describes a court or tribunal deciding a case by assessing the parties’ substantive legal rights and obligations, rather than disposing of it on a purely procedural or technical basis (for example, for being out of time or for lack of jurisdiction). A decision on the merits involves consideration of the relevant facts, evidence and applicable law and results in a determination of liability, entitlement to a remedy, or other final outcome.Across England and Wales, Scotland, Northern Ireland and Ireland, the expression is widely used in civil, criminal and public law proceedings, including judicial review, appeals and interlocutory applications. It is generally a descriptive, common-law expression rather than a term exhaustively defined in legislation, though it appears in case law and procedural rules when distinguishing between substantive and procedural determinations.A judgment or order stated to be “on the merits” is significant for issues such as res judicata, cause of action estoppel, abuse of process, and whether an appeal lies as of right. By contrast, a dismissal not on the merits usually leaves the underlying claim capable, in principle, of being re-brought or reconsidered, subject to limitation and procedural bars.