Weapon systems and their associated training devices must be reconfigured periodically to meet evolving threats and take advantage of new technologies. Changes can be expensive, and can lead to difficulties in maintaining training system and weapon system concurrency. Such problems can be reduced if the need for reconfigurability is planned for early in system development. This paper presents a general approach to providing user interface reconfigurability as a system design feature, describes a specific architecture for reconfigurable interactive systems (ARIS) that supports reconfigurability requirements, and discusses applications and benefits of the approach. Under ARIS the appearance and behavior of a user interface are defined in a database that can be created and modified without changing or recompiling underlying software. ARIS has been used in the development of combat vehicle command and control simulations, an intelligence and electronic warfare console, and an embedded training delivery system.