A method and system are provided for providing event-processing rules in an event-processing environment. The method includes providing at least one generalised event-processing rule to a customer, receiving customer input of rule customization to produce a customized rule, and storing the customized rule in Polish notation for processing using stack-based processing. The method also includes receiving notification of an event for a customer, retrieving a customized rule relating to the customer, and processing the customized rule using stack-based processing.