A system and/or method that generates user interface output sequences controlled by a user interface output system. The user interface output system can provide event definitions to an application pro that specify high-level actions to be performed by the sequence and can issue low-level commands to direct the actions of the user interface output sequence. The user interface output system provides a user interface output controller, which acts as an interface between an application program and the low-level commands which specify tasks for the user interface output sequence to perform. The user interface output controller is generated from a specification, using a planning methodology.