Quick answer: Modern theories of motivation fall into two groups. Content theories explain what motivates people: Maslow’s need hierarchy, Herzberg’s two-factor theory, McGregor’s Theory X and Y, Alderfer’s ERG theory and McClelland’s needs for achievement, affiliation and power. Process theories explain how motivation works: Vroom’s expectancy theory, the Porter-Lawler model, Adams’ equity theory, Locke’s goal-setting theory, reinforcement theory and Deci and Ryan’s self-determination theory.
| Theory | Core idea |
|---|---|
| Maslow (1943) | Five-level need hierarchy |
| Herzberg (1959) | Hygiene factors vs motivators |
| McClelland (1961) | Achievement, affiliation, power |
| Vroom (1964) | Expectancy × instrumentality × valence |
| Adams (1963) | Fairness compared with others |
| Locke (1968) | Specific, challenging goals |
| Deci and Ryan (1985) | Autonomy, competence, relatedness |
Motivation is what makes a person start a task, put effort into it and keep going. Managers have studied it for more than a century, first through money and supervision (scientific management), then through human relations, and from the 1950s onwards through psychology-based theories. The theories below are the ones most often called “modern” theories of motivation, and they still shape how companies design pay, goals, feedback and jobs.
They fall into two groups. Content theories ask what motivates people (which needs they are trying to meet). Process theories ask how motivation works (how people decide how much effort to put in).
Content Theories of Motivation
1. Maslow’s Need Hierarchy Theory
Abraham Maslow (1943) argued that people have five levels of needs: physiological, safety, social, esteem and self-actualisation. A lower need must be largely satisfied before the next one starts to drive behaviour. For managers, it means fair pay and job security come first; recognition and growth only motivate once those basics are covered. Read more in our guide to Maslow’s hierarchy of needs.
2. Herzberg’s Two-Factor Theory
Frederick Herzberg (1959) found that the things that cause dissatisfaction at work are different from the things that cause satisfaction. Hygiene factors such as salary, company policy, supervision and working conditions only prevent unhappiness. Motivators such as achievement, recognition, responsibility and the work itself create real motivation. A pay rise may stop complaints, but it rarely makes someone love the job. See our full two-factor theory guide.
3. McGregor’s Theory X and Theory Y
Douglas McGregor (1960) described two sets of assumptions managers hold. Theory X managers assume people dislike work and must be controlled and threatened. Theory Y managers assume people can enjoy work, seek responsibility and direct themselves when committed to goals. The assumptions tend to become self-fulfilling, which is why Theory Y underpins most modern management. More in Theory X and Theory Y.
4. Alderfer’s ERG Theory
Clayton Alderfer (1969) simplified Maslow into three needs: Existence, Relatedness and Growth. Unlike Maslow, he said several needs can operate at once, and when a higher need is blocked, people fall back on a lower one (the frustration-regression principle). An employee with no route to promotion may start demanding more pay instead.
5. McClelland’s Need Theory
David McClelland (1961) identified three learned needs: achievement (to do things better and meet challenging goals), affiliation (to be liked and belong) and power (to influence others). High achievers often make good entrepreneurs and salespeople; good senior managers usually show a high need for institutional power rather than affiliation.
Process Theories of Motivation
6. Vroom’s Expectancy Theory
Victor Vroom (1964) said motivation depends on three beliefs: expectancy (if I try, can I perform?), instrumentality (if I perform, will I be rewarded?) and valence (do I value the reward?). Motivation = Expectancy × Instrumentality × Valence, so if any one is zero, motivation collapses. A sales target nobody believes is reachable will not motivate, however big the bonus.
7. Porter and Lawler Model
Lyman Porter and Edward Lawler (1968) extended Vroom’s model. Effort leads to performance only if the person also has the ability and a clear understanding of the role. Performance then leads to rewards, and satisfaction depends on whether those rewards feel fair. In this model, good performance causes satisfaction, not the other way round.
8. Adams’ Equity Theory
J. Stacy Adams (1963) argued that people compare the ratio of what they put in (effort, skill, time) and what they get out (pay, recognition) with that of colleagues. If they feel under-rewarded, they reduce effort, ask for more or leave. This is why pay transparency and consistent pay bands matter so much for morale.
9. Locke’s Goal-Setting Theory
Edwin Locke (1968) and later Gary Latham showed that specific, challenging goals lead to higher performance than vague goals such as “do your best”, as long as the person accepts the goal and gets feedback. It is the research behind SMART goals and OKRs.
10. Skinner’s Reinforcement Theory
Based on B. F. Skinner’s work on operant conditioning, reinforcement theory says behaviour that is rewarded tends to be repeated and behaviour that is ignored or punished tends to fade. Managers apply it through timely praise, incentives tied to specific actions and consistent consequences.
11. Self-Determination Theory
Edward Deci and Richard Ryan (1985) argued that lasting, intrinsic motivation comes from meeting three psychological needs: autonomy (control over how you work), competence (getting better at something) and relatedness (connection with others). Their research also suggests heavy reliance on external rewards can weaken intrinsic interest in a task.
Financial and Non-Financial Motivation
Financial motivation is linked directly or indirectly to money: wages and salaries, bonuses, commissions, profit sharing, stock options and retirement benefits. Non-financial motivation includes recognition, responsibility, career growth, flexible working, job security and a good working environment. The theories above suggest that money is necessary to remove dissatisfaction and signal fairness, but non-financial factors usually drive long-term engagement. Read more about the factors affecting employee morale.
How Managers Can Use These Theories
- Cover the basics first: fair pay, safe conditions and job security (Maslow, Herzberg hygiene factors).
- Set specific, stretching but achievable goals and give regular feedback (Locke, Vroom).
- Make the link between performance and reward clear and fair (Vroom, Porter-Lawler, Adams).
- Give people autonomy, learning opportunities and a sense of team (self-determination theory, ERG).
- Recognise good work quickly and specifically (reinforcement theory).
- Match roles to people’s dominant needs, such as achievement-driven people in target-based roles (McClelland).
