One fundamental aim of pleadings is to give notice to the adverse party of what he is going to meet at the trial. He should not be kept in the limbo. He should not be in dark. He should not be kept in abeyance. He is entitled to know the case of the opponent well before trial commences. And so when a part;, states his case in his pleadings, he cannot depart from it, unless the court allows him to do so. And the court can allow him to so depart by allowing an amendment to the original pleadings. And this must be based on an application. If parties are allowed to move in and out of their pleadings at will, the litigation will be more of a game of speculation, particularly as it relates to the facts relied upon by parties. If parties are allowed to move in and out of their pleadings, then there will be no end to litigation as they can freely introduce mid-stream any issue not pleaded to the disadvantage and surprise of the adverse party. That will be over-reaching the adverse party. That is not right. No, not at all.
— Tobi, JCA. Abraham v Olorunfunmi (1990) – CA/L/83/89