Simulation and the user interface: an introduction, M.A. Life. Part 1 General issues: extrapolating from one task to another, L. Bainbridge; a conceptualization of simulation for user interface development, M.A. Life; indivisibility, inseparability and indiscernibility: some problems with simulations for complex domains, A. Taylor & J. Browne; simulation: a stepping-stone between requirements and design, D. Diaper; operational evaluation, V.D. Hopkin. Part 2 Embedded simulations: cognitive modelling as a simulation technique for the development of intelligent user interfaces, P.C. Cacciabue, F. Decortis, M. Masson, & J.P. Nordvik; simulation in the evolution of an intelligent speech interface, J. Monaghan, C. Cheepen, J. Hewitt, & J. Hobson; simulating peer interaction vias computer-based 'help' facilities, C.J. Colbourn & T. Cockerton-Turner; simulation directionality in airbourne auditory warnings and messages, P.L.N. Naish. Part 3 Techniques and applications: discrete dialogue computing systems: detail: an approach to task analysis, D. Edmondson & P. Johnson; simulating the speech operated user interfaces of the future: the case of listening typewriters, R. Dye, J.L. Arnott, A.F. Newell, K.E.P. Carter, & G. Carter, & G. Cruickshank; using hypertalk as a specificaion tool and a simulation vehicle in the development of a personal database system, D. Young, M.W. Lansdale, & C.A. Bass; simulating user interfaces with dBASEIII+ , M.P. Lee, M.W.M Darling, D. Peacock, & S. Jeffreys; simulation and military cockpit voice interface, B. McGuinness. continuous dynamic control systems: optimising the pilot-display interface using part-task simulation: a case description, H. Dudfield; part-task simulation as a tool to investigate the effects of types of lag on positioning performance, S.E. Jensen; the application of manual tracking simulators as aids to system development and evaluation, J.L. Evans; an object oriented design approach incorporationg simulation in the development of a Real-Time control system, R. Frank & J. Hewitt.