Herzberg’s motivation-hygiene theory, also known as the two-factor theory and dual-factor theory was coined by Frederick Herzberg in 1959. He argues that there are two factors that influence the motivation of the employee in the organization.
Expectancy theory is a motivation theory first proposed by Victor Vroom of the Yale School of Management in 1964. Vroom's Expectancy Theory separates effort, performance and outcomes. Vroom’s Expectancy Theory has assumed four assumptions. Expectancy, Instrumentality and Valence.