Robert C. Williges

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Submitted for publication; do not copy or cite without permission. ABSTRACT Among interactive system developers and users there is now much agreement that usability is an essential quality of software systems. The introduction of usability evaluation methods (UEMs) to assess and improve usability in such systems has led to a variety of alternative(More)
Much traditional user interface evaluation is conducted in usability laboratories, where a small number of selected users is directly observed by trained evaluators. However, as the network itself and the remote work setting have become intrinsic parts of usage patterns, evaluators often have limited access to representative users for usability evaluation(More)
A series of 3 studies was conducted to test free-modulus magnitude estimation as a measure of perceived presence in virtual environments (VEs) and to model the first- and second-order effects of 11 VE system parameters on perceived presence across 5 subtasks. Sequential experimentation techniques were used to build 4 empirical models using polynomial(More)
This dissertation is part of a sponsored research contract, the objectives of which were (1) to perform a detailed review of the existing scientific literature on human factors and speech recognition technology, and the literature supporting the use of speech input for controlling in-vehicle tasks; (2) to develop a decision tool that would aid designers in(More)
Despite the increased focus on usability and on the processes and methods used to increase usability, a substantial amount of software is unusable and poorly designed. Much of this is attributable to the lack of cost-effective usability evaluation tools that provide an interaction-based framework for identifying problems. We developed the user action(More)
Although the industrial quality inspection task has been extensively studied, the effect of multitask-ing on the performance of the operator in a hybrid inspection system is still unknown. The experiment described in this article compared the quality inspection performance for participants performing a single task, 3 multiple tasks, and 5 multiple tasks.(More)