Self-service terminal

A self-service terminal (10) is described. The terminal, which may be an ATM, comprises a plurality of modules (14 to 34), and has a control application for controlling the operation of the terminal. The control application comprises a plurality of module driver agents (70), a plurality of module function request agents (72) for requesting functions provided by a module (14 to 34), and a logic engine (66). An interface (76) is provided between the driver agents (70) and the function request agents (72), so that a module driver agent (70) is operable to co-operate with an associated function request agent (72) to provide module functions for the logic engine (66).