This document summarizes Rule 9 of the Rules of Court regarding the effect of failure to plead and the process for declaring a party in default. Key points include: defenses not raised are deemed waived; exceptions where the court can dismiss motu proprio; the effect of dismissing a complaint on counterclaims and cross-claims; the difference between permissive and compulsory counterclaims; the process for declaring a party in default and remedies available; and the different types of proceedings and relief after a declaration of default.