An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Walker N, Catrambone R.Walker N, et al. Among authors: catrambone r.Hum Factors. 1993 Sep;35(3):397-411. doi: 10.1177/001872089303500302.Hum Factors. 1993.PMID: 8244408
Eiriksdottir E, Catrambone R.Eiriksdottir E, et al. Among authors: catrambone r.Hum Factors. 2011 Dec;53(6):749-70. doi: 10.1177/0018720811419154.Hum Factors. 2011.PMID: 22235535