What is diffusion of innovations?
Diffusion of innovations explains how new ideas, technologies and products catch on. It traces back to Ryan and Gross's 1943 study of Iowa farmers adopting hybrid seed corn, and Everett Rogers pulled research from many fields together in his 1962 book Diffusion of Innovations. Rogers defined diffusion as the process by which an innovation is communicated through certain channels over time among the members of a social system.
The five adopter categories
| Category | Share | Profile |
|---|---|---|
| Innovators | 2.5% | Venturesome risk-takers |
| Early adopters | 13.5% | Respected opinion leaders who make or break diffusion |
| Early majority | 34% | Deliberate; adopt after weighing it up |
| Late majority | 34% | Skeptical; adopt out of necessity or peer pressure |
| Laggards | 16% | Tradition-minded; last to adopt |
The percentages come from treating adoption time as a normal distribution split by standard deviations. Added up, adoption follows an S-curve: slow at first, then rapid, then leveling off. Geoffrey Moore (1991) argued there's a hard-to-cross gap, the chasm, between early adopters and the early majority.
What makes an innovation spread faster?
- Relative advantage: the better it seems than what it replaces, the faster it spreads.
- Compatibility: fitting existing values and experience helps.
- Complexity: the harder it is to understand or use, the slower.
- Trialability: being able to try it on a small scale lowers the risk.
- Observability: visible results encourage others.
Individuals move through an innovation-decision process: knowledge → persuasion → decision → implementation → confirmation.
Uses and critiques
The theory shows up in product launches, public health campaigns, agricultural extension and education policy, and the Bass model (1969) uses it to forecast demand. It pairs naturally with disruptive innovation, the product life cycle and the bandwagon effect. Critics point to a pro-innovation bias (assuming new is always better), a tendency to blame late adopters, and an overly individual-level focus.
FAQ
- Are early adopters the same as innovators?
- No. Innovators are the first 2.5% to try something; early adopters are the next 13.5% and tend to be influential opinion leaders.
- Which courses cover this theory?
- Communication, marketing, sociology, health education and information systems all use it.
Sources reviewed: 2026-10-25
References
- Rogers, E. M. (2003). Diffusion of Innovations (5th ed.). New York: Free Press.
- Ryan, B., & Gross, N. C. (1943). The diffusion of hybrid seed corn in two Iowa communities. Rural Sociology, 8(1), 15–24.
- Bass, F. M. (1969). A new product growth for model consumer durables. Management Science, 15(5), 215–227.