Designing for usability: key principles and what designers think
Communications of the ACM
ACM Transactions on Information Systems (TOIS)
The design of phone-based interfaces for consumers
CHI '89 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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We studied the use of a computer-based voice mail system within an organization, and users' attitudes toward it. This system allowed users to send and receive voice messages using pushbutton telephones. It offered editing, filing, retrieval, distribution, and control functions.