Title: User Interface Design for Interactive Theorem Provers Abstract: The technology of mechanized theorem proving (doing formal proofs by computer) is vitally important to the use of formal methods in actual software engineering practice. But one major obstacle to the use of this technology is the poor quality of user interface provided by many systems. Although there have been projects to develop good interfaces for specific systems, the designers of these interfaces have almost universally failed to draw upon modern methods of research in Human Computer Interaction. This talk will describe some preliminary results obtained as part of a project designed to rectify this lack of analysis. First, some thoughts about the interaction between users and a specific interactive theorem prover (the HOL system) will be presented. The talk will then present the results of an empirical study of intermediate and expert HOL users. The results will be analysed with a view to formulating principles of good interface design for interactive proof systems. The talk will be non-technical, and will aim merely to introduce this new and exciting area of HCI research. This will be a warm-up talk for a seminar I'm going to give at King's College, London, on 15 November.