The VIE Model
Victor Vroom published Work and Motivation in 1964, proposing that motivational force is a function of three separable beliefs, and that the relationship between them is multiplicative, not additive.
Expectancy is the belief that effort will lead to performance. “If I work hard on this, will I actually be able to do it well?” A person who believes they lack the capability or resources to succeed, regardless of effort, has zero expectancy. That zero collapses the entire motivation equation.
Instrumentality is the belief that performance will lead to outcomes. “If I do this well, will it actually produce the reward or recognition I expect?” A person who has been promised a promotion that never materialized, or whose high-quality work goes unacknowledged, has low instrumentality. They have learned that performance does not reliably produce outcomes.
Valence is the value placed on the expected outcome. “Is the reward I expect to get something I actually care about?” A person offered a bonus in a currency they don’t value (public recognition for someone who prefers privacy, team activities for someone who values individual achievement) has low valence.
The multiplicative structure is the key insight: Motivation = Expectancy × Instrumentality × Valence. Any zero produces zero motivation, regardless of how high the other two factors are.
The Evidence
Van Eerde and Thierry’s 1996 meta-analysis in the Journal of Applied Psychology examined 77 studies testing the VIE model. The components, especially valence and instrumentality, showed consistent correlations with effort, performance, and job preferences. The model’s components are real and separable.
The multiplicative form has mixed empirical support; some studies find additive combinations predict behavior as well. But the diagnostic insight survives: you need to assess all three components to understand a motivation problem, and a deficiency in any single one can fully explain apparent underperformance from a highly capable person.
Common Misdiagnoses
Most management interventions for unmotivated performers target the wrong component:
- Compensation increases for low-instrumentality problems. If the issue is that the person doesn’t believe performance leads to reward, because promises have been broken, recognition is inconsistent, or politics determine outcomes, adding more money to the valence side does nothing. The problem is trust in the mechanism, not the size of the potential reward.
- Training for low-expectancy problems that are actually resource problems. A person who believes they can’t succeed may need not training but different tools, clearer briefs, or a smaller initial scope. Sometimes low expectancy reflects realistic assessment of an insufficient environment rather than insufficient capability.
- Motivational speeches for valence problems. If a person genuinely doesn’t care about the reward being offered, no amount of inspiration about the importance of the work changes that. Understanding what outcomes the individual actually values, and whether those are achievable through the current role, is the only intervention that addresses valence.
Diagnosing the Problem
The practical use of expectancy theory is diagnostic. When a capable person is underperforming or disengaged, three questions surface the root cause:
- “Do you believe you can do this well if you try?” Tests expectancy. If no: address capability, resources, or task fit.
- “Do you believe that doing this well will lead to the outcomes we’ve discussed?” Tests instrumentality. If no: address credibility, history, and the reliability of the reward mechanism.
- “Are the outcomes we’re offering actually ones you want?” Tests valence. If no: understand what this person actually values and whether the role can deliver it.