This volume covers the proceedings of the Workshop on User Interface Management Systems and Environments held at INESC, Lisbon, Portugal, 1990. The main impetus for the workshop came from the Graphics and Interaction group in the Technical Interest Group of the European Community ESPRIT Programme. Several of the fundamental concepts in User Interface Management Systems (UIMS) were established at the Eurographics workshop held in Seeheim in November 1983 (proceedings published in this series). Since then, the development of windowing systems, object-oriented methodologies and AI-inspired techniques have developed on an unprecedented scale. The purpose of this workshop, therefore, was to re-examine the basic principle of a UIMS and to question its continuing relevance in the context of current and probable future systems. This entailed an attempt to relate the idea to the newer paradigm of a "user interface development environment" and an assessment of the impact of "knowledge engineering" both in the interface and in the application.
