In a first aspect of the present invention, methods and apparatus implement graphical user interfaces for interactively specifying service level agreements used to regulate delivery of services to, for example, computer systems An interactive graphical user interface allows a user to see the effects of varying values of service delivery variables on the level of service achievable in a particular service delivery context In a second aspect, methods and apparatus of the present invention provision resources required for service delivery In the second aspect, the methods and apparatus of the present invention select a service delivery model dependent on context The selected service delivery model is used to provision resources that will be required during service delivery In a third aspect, methods and apparatus of the present invention monitor compliance with a service level agreement duπng a service delivery event.