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is a Senior Research Computer Scientist at Carnegie Mellon University, where he is the principal investigator for the Garnet User Intdace Development Environment and the Demonstrational Intdaces Projtzt. entail.* bam@cr.cmu.edu etting the user interface right is becoming critical to the success of products, and everyone knows that designing and implementing human-computer interfaces is difficult and time-consuming. But why is this true? Should we expect that a new method is around the corner that will make the design significantly easier? Will the next generation of user interface toolkits make the implementation trivial? No. This article discusses reasons why a focus on the user interface is important, and why user interface design and implementation are inherently difficult tasks and will remain so for the foreseeable future.

Challenges of HCI design and implementation