High Quality Content by WIKIPEDIA articles! The Two-factor theory (also known as Herzberg`s motivation-hygiene theory and Dual-Factor Theory) states that there are certain factors in the workplace that cause job satisfaction, while a separate set of factors cause dissatisfaction. It was developed by Frederick Herzberg, Frederick Herzberg`s book The Motivation to Work`, written with research colleagues Bernard Mausner and Barbara Bloch Snyderman in 1959, first established his theories about motivation in the workplace. Herzberg`s survey work, originally on 200 Pittsburgh engineers and accountants remains a fundamentally important reference in motivational study. While the study involved only 200 people, Herzberg`s considerable preparatory investigations, and the design of the research itself, enabled Herzberg and his colleagues to gather and analyse an extremely sophisticated level of data..