This well-established instrument has been repeatedly investigated for reliability and validity. The nine sub-scales related moderately to well between each other, internal consistency; a score of for coworker to for the total scale. Overall, an average on for internal consistency was obtained out of a sample of 3,067 individuals. Over a 18 month time period, an internal consistency of - was calculated for a smaller sample of 43 workers. Studies using various scales for job satisfaction on an single employee, supported validity. A correlation of for coworkers to for supervision was calculated between five of the Job Satisfaction sub-scale and some of the Job Description Index.