Alan Chappell specializes in user-centered system design and development. His primary interests are identifying domain characteristics and understanding user’s needs to guide design processes, then integrating advanced information technologies (including knowledge-based tools, data management, and visualization) into computational environments that meet those design requirements. He has extensive experience in working with a variety of knowledge-based representations/systems and has focused on aspects from creating representational vocabularies that meet domain and analytical requirements to mechanisms for annotation and retrieval of knowledge. He has worked with users in a spectrum of domains to understand their work practice and environment using function and task analysis as well as modeling and simulation. Further, Alan’s experience includes using the results of these analyses in the design of systems and processes that meet organizational goals through appropriate use of enhanced user interaction, mediated collaboration, and training.