Creation of Tonal and Speech Alarm Efficacy Scales

Main Article Content

Ryan A. Lange
Stephen Rice
Cameron M. E. Severin
Jonah S. L. Chiu
Keith J. Ruskin
Connor Rice

Abstract

Alarms have been in use for decades in aviation; however, it is still the case that many alarms are sub-optimally designed and do not perform well. Some alarms are so poorly designed that they increase workload, confuse the user, and/or cause a severe loss of trust. When users are asked about alarm efficacy, they often say that the alarm is either good or bad. While this provides some useful subjective information, we would argue that a quantitative scale offers more value. Using a consensus research method to ensure construct validity, we solicited 2362 participants across a four-phased, one-year study in the development of a Tonal Alarm Efficacy Scale and a Speech Alarm Efficacy Scale. A factor analysis using principal components and varimax rotation provided strong evidence of validity, while Cronbach’s Alpha and Guttman’s Split Half tests were used to ensure high consistency and reliability, respectively. Follow-up analyses highlight the sensitivity of the scales. These types of quantitative scales can provide a means for users, designers, engineers, and human factors experts to communicate in a common language to design more effective alarms for our society. The present study attempts to fill a gap in the current literature by providing Tonal and Speech Alarm Efficacy Scales for use applications in aviation.

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