Systems, methods, and computer program products for providing services, and for enabling changes in the services, are described herein. The services are, for example, continuous, recurring, and/or periodic, and include utility service, periodical delivery service, insurance, etc., and combinations thereof. Customers can issue instructions to service providers (over the Internet, for example) to modify services being provided to the customer. Upon receipt of those instructions, a corresponding service provider takes appropriate action to adjust the service in accordance with the instructions. Customers may also define Service Adjustment Triggers, which specify one or more conditions and one or more changes to the service. Occurrence of the conditions results in implementation of the changes.