It must be appreciated that there cannot be a better notice of a case a party intends to make than his pleading. It is a mere notice and can never be substituted for the evidence required in proof of the facts pleaded, subject however to an admission made by the other party. Unless through skilful cross-examination discrediting the case of the other party, he is still bound to lead evidence in support of his own pleading. Where evidence is adduced to buttress a pleading, then it is good news for the pleader, as it strengthens his case. However, evidence adduced in support of facts not pleaded goes to no issue and should therefore be disregarded ORIZU V. ONYAEGBUNAM 1978.5 S.C. 21 at 820. In ACB V. GWAGWALADA 1994. 5 NWLR Part 342 page 25 at 27 it was held that before considering admissibility of any evidence or document in support of a party’s case it must be shown that the evidence sought to be led is relevant. Even if the evidence is admissible and it is not relevant, the admission of such evidence does not advance the case of the party.
— A. Jauro, JCA. Chevron v. Aderibigbe (2011) – CA/L/76/04