Which motivation theory specifically proposes that an individual's attitudes about work shape their expectations of reward and the effort they invest?

The theory that explicitly explains how people's attitudes about their jobs influence their motivation and work performance is the Porter and Lawler Model (1968). Published in their book titled 'Managerial Attitudes and Performance', Porter and Lawler proposed a multivariate model showing that an individual's attitude specifically their belief that effort leads to performance and that performance leads to valued rewards directly shapes motivation. This model extended Vroom's Expectancy Theory by adding variables such as abilities, role perceptions, and the nature of rewards (intrinsic vs. extrinsic). Maslow's model addresses hierarchical needs; Herzberg's model distinguishes motivators from hygiene factors; Reinforcement Theory focuses on consequences of past behaviour. None of these other theories specifically centre on how attitudes drive motivation and performance the way Porter and Lawler's model does.