Porter & Lawler Model
A classic process theory showing that motivation is not a straight line from reward to effort. Performance depends on ability and role clarity, rewards follow performance, and satisfaction emerges only when rewards are valued and perceived as fair.
Why the Model Matters in Motivation Theory
The Porter and Lawler Model is one of the most important process models in organizational behavior because it challenged a very common but simplistic assumption: that satisfied employees naturally perform better. Porter and Lawler reversed that intuition. They argued that performance can lead to satisfaction – but only when performance is followed by valued rewards that are perceived as fair.
Motivation is a system, not a single push. Effort depends on the value of rewards and the belief that effort will actually be rewarded. Performance depends not only on effort, but also on abilities, traits, and role perceptions. Rewards follow performance, and satisfaction depends on whether those rewards are judged equitable.
- Theorists: Lyman W. Porter and Edward E. Lawler III
- Key source: Managerial Attitudes and Performance (1968)
- Type: process theory of motivation
- Roots: extension of expectancy theory
- Main variables: effort, ability, role perception, performance, rewards, equity, satisfaction
- Main use areas: HRM, performance management, reward systems, OB, leadership
- Effort does not equal performance.
- Performance depends on three things: effort, abilities/traits, and role perceptions.
- Rewards are of two kinds: intrinsic and extrinsic.
- Satisfaction comes after performance and rewards, not necessarily before.
- Perceived fairness matters: the model has an equity component built in.
- It extends Vroom: expectancy logic plus performance conditions and reward consequences.
The Scholars Behind the Model
Porter and Lawler were writing at a time when motivation theory was moving away from simple need hierarchies and toward more cognitive explanations of choice, effort, and performance. Their model helped make organizational behavior more analytically precise by linking motivation with performance systems and reward structures.
Porter helped shape the field of organizational behavior as a rigorous academic discipline. His work linked motivation, attitudes, commitment, and performance, and pushed management research toward more careful causal thinking.
Lawler became one of the major scholars of rewards, compensation, and organizational effectiveness. His involvement helps explain why the Porter-Lawler framework is especially strong on the connection between performance, rewards, and satisfaction.
The Full Porter-Lawler Causal Loop
The power of the model lies in the fact that it does not treat motivation as a one-step process. It starts with effort, but then traces how effort becomes performance only under certain conditions, how performance leads to rewards, and how satisfaction depends on the perceived fairness and value of those rewards.
The model’s most famous contribution is the claim that performance is not simply the result of desire. Even motivated people can fail to perform if they lack ability or do not understand what the role requires. That makes the model especially valuable in management and HRM.
The Model in Four Analytical Stages
One effective way to study the Porter-Lawler model is to break it into four linked stages: effort, performance, rewards, and satisfaction. This makes the theory easier to explain in exams and much easier to apply in organizational diagnosis.
Effort is influenced by two major things: the value of rewards and the perceived probability that effort will lead to those rewards. This is where the model clearly overlaps with expectancy theory.
Porter and Lawler insisted that performance is shaped by more than effort. Two additional variables matter: abilities and traits, and role perceptions. A person may try hard, but if they lack the capability or misunderstand what is expected, performance will still suffer.
The model divides rewards into intrinsic rewards and extrinsic rewards. Intrinsic rewards come from the work itself, such as achievement, competence, or pride. Extrinsic rewards come from the organization, such as pay, promotion, status, and recognition.
Satisfaction does not arise automatically after rewards are given. People judge whether the rewards are equitable relative to what they put in and relative to what others receive. This introduces a clear fairness element that connects the model to later thinking about organizational justice and to Adams’ equity theory.
How the Model Extends Vroom and Moves Toward Equity
Porter and Lawler did not invent their model in isolation. It clearly grows out of expectancy theory, but adds several crucial refinements. It also anticipates fairness-based thinking by emphasizing the role of perceived equitable rewards.
- Reward value matters.
- Expectancies about effort and outcomes matter.
- Motivation is cognitive and future-oriented.
- Performance is shaped by ability and role clarity, not effort alone.
- Rewards are divided into intrinsic and extrinsic forms.
- Satisfaction depends on perceived fairness of rewards.
- The model becomes a loop rather than a one-step calculation.
| Question | Vroom | Porter & Lawler |
|---|---|---|
| What drives effort? | Expectancy, instrumentality, valence | Value of rewards and effort-reward expectancy |
| Does effort guarantee performance? | Not deeply specified | No – ability and role perceptions intervene |
| What follows performance? | Outcomes/rewards | Intrinsic and extrinsic rewards |
| How does satisfaction arise? | Not a central conclusion | From rewards judged equitable |
| What is the major contribution? | Choice to exert effort | Full process from effort to satisfaction |
If Vroom mainly explains why a person chooses to exert effort, Porter and Lawler explain what must happen after effort for performance and satisfaction to actually follow.
What the Model Gets Right and Where It Gets Criticized
The Porter-Lawler framework is respected because it is more realistic than simple reward theories. But like many broad classic models, its strength is largely conceptual and integrative rather than based on a single perfectly confirmed test.
Why the Model Still Commands Respect
The model recognizes that effort, performance, rewards, and satisfaction are not identical. This realism makes it more persuasive than theories that collapse everything into one direct chain.
It integrates expectancy logic, ability, role clarity, reward type, and equity. That makes it valuable as a teaching model and a management diagnostic framework.
The model helps explain why high performers may still feel dissatisfied if their rewards are not fair, and why satisfied employees are not always the best performers.
It is practically useful because it directs managers to diagnose multiple points of failure – motivation, ability, role ambiguity, reward design, or fairness.
Main Criticisms
- Complexity: the model is conceptually rich but harder to test cleanly as a full system.
- Measurement issues: several variables are subjective and difficult to measure precisely.
- Broad scope: because the framework includes many links, studies often test only parts of it.
- Historical context: later theories such as Self-Determination Theory are more specific about psychological needs.
- Limited simplicity: managers may find the model less immediately usable than simpler frameworks.
The Porter-Lawler Model is often stronger as an integrative explanatory map than as a tightly testable single law. Its value is high, but its complexity is also a burden.
Balanced Academic Verdict
The model remains important because it captures a truth many simpler theories miss: performance, rewards, and satisfaction are related but not interchangeable. It is especially useful for teaching, diagnosis, and structured essay analysis in OB and HRM.
IASNOVA.COMHow the Model Works in Real Organizations
The Porter-Lawler Model is especially useful when performance systems fail. It helps managers ask whether the problem lies in effort, skill, clarity, reward design, or fairness.
Management and Leadership
- Diagnosing why high effort is not becoming high performance
- Separating motivation problems from skill problems
- Improving role clarity and expectation setting
- Aligning rewards with actual performance
The model warns managers not to assume pay increases alone will solve performance problems. If role perceptions are confused or skills are weak, extra rewards may change effort without producing results.
Human Resource Management
The model is highly relevant to appraisal, compensation, promotion, and reward-system design because it emphasizes that satisfaction depends not just on receiving rewards, but on receiving valued and equitable rewards.
- Performance appraisal needs role clarity.
- Reward systems need credibility and fairness.
- Intrinsic rewards matter alongside pay and promotion.
- Employee dissatisfaction may signal perceived inequity rather than laziness.
Education and Training
The Porter-Lawler model also helps explain classroom and training performance. Effort is not enough if students lack competence or misunderstand task demands. Satisfaction with learning depends partly on whether outcomes feel deserved and meaningful.
IASNOVA.COMHow Students Can Use This Model
- If you study hard but scores stay low, check role perception: do you understand what the exam demands?
- If effort is low, check whether the reward is truly valued and believable.
- If achievement feels empty, check the satisfaction stage: did the outcome feel fair and meaningful?
- This model is excellent for case-study answers because it diagnoses multiple breakdown points.
How It Compares with Other Motivation Theories
This is one of the most comparison-friendly theories in motivation studies because it sits between expectancy logic, equity logic, and performance management.
| Theory | Main Overlap | Main Difference | Best Exam Use |
|---|---|---|---|
| Vroom’s Expectancy Theory | Both are cognitive process theories of motivation | Porter and Lawler add ability, role perception, rewards, and satisfaction consequences | Use as the standard “extension of Vroom” comparison |
| Adams’ Equity Theory | Both treat fairness as important | Adams centers fairness comparisons; Porter-Lawler inserts fairness into the satisfaction stage after rewards | Useful fairness linkage in essays |
| Locke’s Goal-Setting Theory | Both explain performance through a multi-step process | Locke emphasizes goal properties; Porter-Lawler emphasizes reward value, ability, and equity | Compare target-setting vs reward-performance systems |
| Herzberg’s Two-Factor Theory | Both discuss satisfaction | Herzberg focuses on job factors; Porter-Lawler explains the process linking performance, rewards, and satisfaction | Good contrast between content and process theories |
| McClelland’s Theory of Needs | Both can explain why rewards differ in attractiveness across individuals | McClelland focuses on acquired motives; Porter-Lawler focuses on the process after effort begins | Use to compare motive differences vs systemic process |
Exam and Essay Strategy
The Porter-Lawler Model is a favorite exam theory because it looks complex at first glance but becomes very score-friendly once you understand the flow.
- Reducing it to expectancy theory: it is more than Vroom.
- Forgetting ability and role perceptions: these are central.
- Ignoring reward types: intrinsic and extrinsic rewards both matter.
- Missing the reversal: performance can lead to satisfaction.
- Skipping equity: perceived fairness is essential to satisfaction.
- Define the model as a process theory of motivation.
- Explain the sequence: effort → performance → rewards → satisfaction.
- Add the conditions: ability, traits, and role perceptions.
- Discuss reward types: intrinsic and extrinsic.
- Evaluate: realism and integrative value versus complexity and measurement difficulty.
- Compare: especially with Vroom and Adams.
The Porter-Lawler Model remains one of the most sophisticated classic motivation frameworks because it recognizes that effort, performance, rewards, and satisfaction are linked but not identical. Its greatest strength is realism: it shows that performance depends on more than desire and that satisfaction depends on more than receiving rewards. Its greatest weakness is complexity: the model is broad, multi-variable, and harder to test or use quickly than simpler theories. Even so, it remains highly valuable for OB and HRM because it explains where motivational systems break down.
Frequently Asked Questions
These answers are written for revision and snippets while staying aligned with the page schema.
Key Academic References
- Porter, L. W., & Lawler, E. E. III. (1968). Managerial Attitudes and Performance. Irwin-Dorsey.
- Kopelman, R. E. (1977). A causal-correlational test of the Porter and Lawler framework. Administrative Science Quarterly, 22(2), 296-314.
- Lawler, E. E. III. (1971). Pay and Organizational Effectiveness: A Psychological View. McGraw-Hill.
- Steers, R. M., Porter, L. W., & Bigley, G. A. (1996). Motivation and Leadership at Work. McGraw-Hill.
- Pinder, C. C. (2014). Work Motivation in Organizational Behavior. Psychology Press.
- Miner, J. B. (2003). The rated importance, scientific validity, and practical usefulness of organizational behavior theories. Academy of Management Learning & Education, 2(3), 250-268.
- Lawler, E. E. III. (1994). Motivation in Work Organizations. Jossey-Bass.
- Vroom, V. H. (1964). Work and Motivation. Wiley.
- Adams, J. S. (1965). Inequity in social exchange. In Advances in Experimental Social Psychology (Vol. 2, pp. 267-299). Academic Press.
