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McMulkin ML, Kroemer KH. Usability of a one-hand ternary chord keyboard. Appl Ergon. 1994;25(3):177-81doi: 10.1016/0003-6870(94)90016-7.
McMulkin, M. L., & Kroemer, K. H. (1994). Usability of a one-hand ternary chord keyboard. Applied ergonomics, 25(3), 177-81. https://doi.org/10.1016/0003-6870(94)90016-7
McMulkin, M L, and Kroemer, K H. "Usability of a one-hand ternary chord keyboard." Applied ergonomics vol. 25,3 (1994): 177-81. doi: https://doi.org/10.1016/0003-6870(94)90016-7
McMulkin ML, Kroemer KH. Usability of a one-hand ternary chord keyboard. Appl Ergon. 1994 Jun;25(3):177-81. doi: 10.1016/0003-6870(94)90016-7. PMID: 15676966.
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Appl Ergon. 1994 Jun;25(3):177-81. doi: 10.1016/0003-6870(94)90016-7.

Usability of a one-hand ternary chord keyboard.

Applied ergonomics

M L McMulkin, K H Kroemer

Affiliations

  1. Industrial Ergonomics Laboratory, Human Factors Engineering Center, Industrial and Systems Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0118, USA.

PMID: 15676966 DOI: 10.1016/0003-6870(94)90016-7

Abstract

Five subjects learned to operate a one-hand ternary chord keyboard with 18 different characters, on average, in just over 30 min. Subjects practised inputting numeric-type text for an additional 60 h and attained an average peak keying speed of 170 characters/min. Because of the short learning time, high performance, and low space requirement, the one-hand ternary chord keyboard is an attractive input device for tasks with small character sets.

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