1. A signal-bearing medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus of a computer system to perform operations for managing interactive specification of a new service level agreement to govern a contemplated service delivery, the operations comprising: receiving a selection of a particular service level agreement; accessing a machine-readable electronic file corresponding to the selected particular service level agreement, the electronic file comprising at least a description of a graphical representation of the selected particular service level agreement for use by a graphical user interface of the computer system; displaying the graphical representation of the selected particular service level agreement on the graphical user interface of the computer system using the machine-readable electronic file, wherein the graphical representation displays an initial value of at least one service variable, an initial value of at least one service level attribute, and an initial value of a cost estimate for the contemplated service delivery; receiving a selection of a new value for the at least one service variable; receiving an updated value for the at least one service level attribute, wherein the updated value depends at least in part on the selected new value for the at least one service variable; receiving an updated value of the cost estimate for the contemplated service delivery, wherein the updated value of the cost estimate depends at least in part on the selected new value for the at least one service variable; and displaying the selected new value, the updated value, and the updated cost estimate in the graphical representation of the service level agreement.