Atolagbe v. Shorun (1985) 1 NWLR (Pt. 2) 360 at 365 where Coker, J.S.C. in dealing with the main function of pleadings in the trial of an action had this to say: – “The primary function of pleadings is to define and delimit with clarity and precision the real matters in controversy between the parties upon which they can prepare and present their respective cases and upon which the court will be called to adjudicate between them. It is designed to bring the parties to an issue on which alone the court will adjudicate between them party is bound by his pleading and cannot go outside it to lead evidence or rely on facts which are extraneous to those pleaded.”
COURTS MUST BE GUIDED BY PLEADINGS
Both courts must be fully guided by the pleadings, which in this case are the petition and the replies. If a witness gives oral evidence on what is not pleaded in either the petition or the reply, the evidence will be of no probative value based on the principle of law that parties are bound by their pleadings. If evidence is not led on a fact pleaded in either the petition or the reply the fact will be deemed to have been abandoned unless the fact was admitted by the adverse party. This is because pleadings have no mouth to talk and need human being with mouth and sense to articulate them in court. This principle of law will not apply where the particular pleading is admitted.
— Niki Tobi, JSC. Buhari v. INEC (2008) – SC 51/2008