Lesson 9 — Rogers: How Adoption Spreads Through a Social System
Rogers answers a different question from Bridges or Kotter: once an innovation exists, how does adoption spread and how does an individual decide?
Five adopter categories
| Category | Proportion in chapter | Practical implication |
|---|---|---|
| Innovators | 2.5% | earliest experimenters |
| Early Adopters | 13.5% | influential early users; highest opinion leadership |
| Early Majority | 34% | mainstream users often seeking evidence and practical confidence |
| Late Majority | 34% | more skeptical; follows established proof/social norms |
| Laggards | 16% | last to adopt; some persistent resistance may remain |
Two diffusion challenges
- Cross from Innovators/Early Adopters into the mainstream Early Majority.
- Later decide how to handle the Late Majority/Laggard boundary when 100% conversion may not be realistic.
Four diffusion elements
- innovation;
- communication channels;
- time;
- social system.
Five adoption stages
- Knowledge — awareness/learning.
- Persuasion — form favorable or unfavorable attitude; seek information.
- Decision — choose adopt or reject.
- Implementation — put the innovation into use.
- Confirmation — seek reinforcement and continue/reconsider based on evidence and experience.
Category ≠ stage. “Early Adopter” describes relative adoption pattern; “Persuasion” or “Decision” describes where that person currently is for a particular innovation.
Five acceptance/rejection factors
- Relative advantage — Is it better than the current way?
- Compatibility — Does it fit values, needs and working context?
- Complexity / simplicity — How hard is it to understand/use?
- Trialability — Can people test it before full commitment?
- Observability — Can people see the results/benefits?
High-confusion pairs
- Trialability = can try.
- Observability = can see.
- Relative advantage = worth it / better.
- Compatibility = works here / fits context.
A pilot can improve trialability and, if results are visible, observability—but the two questions remain different.
Retrieval check
Q: A metadata pilot has enthusiastic Early Adopters, but the Early Majority waits for proof it helps normal work. What matters?
A: Visible relative advantage, observability and trialability, reinforced by credible Early Adopters.
Source: pp. 565–569.