[ACM Press the SIGCHI conference - Portland, Oregon, USA (2005.04.02-2005.04.07)] Proceedings of the SIGCHI conference on Human factors in computing systems - CHI '05 - A method to standardize usability metrics into a single score

✍ Scribed by Sauro, Jeff; Kindlund, Erika

• Book ID: 121386445
• Publisher: ACM Press
• Year: 2005
• Tongue: English
• Weight: 537 KB
• Category: Article
• ISBN-13: 9781581139983
• DOI: 10.1145/1054972.1055028

✦ Synopsis

Current methods to represent system or task usability in a single metric do not include all the ANSI and ISO defined usability aspects: effectiveness, efficiency & satisfaction. We propose a method to simplify all the ANSI and ISO aspects of usability into a single, standardized and summated usability metric (SUM). In four data sets, totaling 1860 task observations, we show that these aspects of usability are correlated and equally weighted and present a quantitative model for usability. Using standardization techniques from Six Sigma, we propose a scalable process for standardizing disparate usability metrics and show how Principal Components Analysis can be used to establish appropriate weighting for a summated model.