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Expectancy Theory

Porter & Lawler


Porter and Lawler (Lyman W Porter and Edward E Lawler) used Victor Vroom’s Expectancy Theory as a foundation to develop their expectancy model. Similar to Vroom’s theory Porter and Lawler concluded that an individual’s motivation to complete a task is affected by the reward they expect to receive for completing the task. However Porter and Lawler introduced additional aspects to the expectancy theory as they felt that Vroom's theory was too simple.

The diagram below illustrates the two types of motivation rewards under Porter & Lawler's Expectancy Theory

Porter and Lawler Expectancy Theory Diagram

Intrinsic And Extrinsic Rewards

Porter and Lawler categorised the reward as intrinsic and extrinsic

Porter and Lawler's Expectancy Theory Model suggested that an individual's view regarding the attractiveness and fairness of the rewards will affect motivation.

Ability And Perception

Porter and Lawler said that motivation is also affected by

  1. the individual’s ability to perform the task and
  2. their perception of the task


Post Job Completion Reward

Once the individual has completed the task their motivation will drop if the intrinsic and extrinisic reward received does not match their expectations of the reward they has expected to receive.


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