12 participants with a high level of domain experience used two different, mouse-based, interaction techniques to carry out three workstation file management tasks of varying complexity. One technique followed a standard Object-Action model; the other was a newly developed technique called COAS (Combined Object-Action Selection). There was little difference in performance on a simple task; performance for participants using the new technique was 38% faster on a moderately complex task and was 21% faster on a complex task. The file management application, interaction techniques and experiment were implemented in an OS/2 Presentation Manager style using ITS (Interactive Transaction System).
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