How does neorealism differ from classical realism?

Neorealism and classical realism are both foundational theories in international relations, yet they differ significantly in their methodology and focus.

Methodological Differences

Classical realism, associated with thinkers like Hans Morgenthau, is rooted in history, philosophy, and theology. It often emphasizes human nature and the quality of statecraft as primary drivers of political behavior.1

In contrast, neorealism—pioneered by Kenneth Waltz—seeks to transform realism into a rigorous, parsimonious social-scientific theory. It draws heavily on microeconomics to explain state behavior through systemic logic rather than individual or domestic factors.1

Levels of Analysis

The most distinct difference lies in the level of analysis:
* Classical Realism: Considers a wide range of factors, including domestic institutions, national morale, and human nature, to explain international outcomes.1
* Neorealism: Argues that these internal factors are largely irrelevant. Instead, it focuses exclusively on the anarchic structure of the international system and the distribution of power among states. Neorealists view states as unitary, rational actors conditioned by this system to prioritize survival.12