Frederick Herzberg’s “The Motivation to Work” presents the results of over 200 interviews with engineers and accountants working in the Pittsburgh area regarding what satisfied and dissatisfied them on the job. They would find that factors leading to satisfaction, such as achievement and performance, were very different than those leading to dissatisfaction, such as company policies or relationships with co-workers and managers. The result became known as Herzberg’s Two-Factor Theory of Job Satisfaction, also known as the motivator-hygiene theory.