Study Guide: Chapter 9 — Nature and Necessity of Revolutions

Core Concept

Revolutions are noncumulative: the new paradigm is incompatible AND incommensurable with the old — different problems, standards, meanings. Debates are circular; persuasion, not proof, decides. Politics is the model.

Key Terms

Incommensurability · noncumulative change · circularity · revolution

Case Summary

Einstein doesn't extend Newton: deriving Newtonian equations changes what mass, space, and time mean. The "special case" is a different ontology wearing familiar symbols.

Application Checklist

• [ ] In your current big debate, list each side's success criteria — check for circularity
• [ ] Identify terms that changed meaning between camps ("quality", "done")
• [ ] Design a demonstration-that-recruits instead of another argument

Self-Test

1. Why can't normal rules settle paradigm debates?
2. In what precise sense is Newton NOT a special case of Einstein?
3. Map Kuhn's political-revolution analogy stage by stage.