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Over time, job satisfaction ________________________(define) in a number of ways. Edwin Locke said that job satisfaction ________________________ (determine) by the difference between what one wants in a job and what one has in a job. Herzberg states that satisfaction and dissatisfaction ________________________(drive) by different things - motivation and 'hygiene' factors (such as pay), respectively. Motivation ________________________ (can /see) as an inner force that drives people to perform. One of the most famous ways of measuring job satisfaction is the Minnesota Job Satisfaction Questionnaire, which ________________________ (create) in 1963. Some researchers say that people who ________________________(satisfy) with life tend to ________________________(satisfy) with their job.