theory of motivation is also called 'Two Factor Theory', 'Dual Factor Theory' and 'Hygiene / Maintenance Theory of Motivation'. This theory is based on the information collected by him and his associates (in the USA in 1959) by interviewing two hundred engineers and accountants. The information collected relates to the attitude of people towards work. This attitude towards work depends on two sets of factors namely hygiene or maintenance factors and the motivating factors.