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Archaeological theory emerged as a self-conscious discourse in the early 20th century, crystallizing around the paradigm of Culture-Historical Archaeology. This framework, dominant until the mid-century, treated archaeological cultures as proxies for past peoples. Its methodology focused on defining, classifying, and mapping the spatial and temporal distributions of material culture to reconstruct migration, diffusion, and invasion narratives as primary drivers of change. This approach established archaeology's core practice of systematic typology and chronology but was criticized for its descriptive and particularistic nature.
A major methodological revolt occurred in the 1960s with the rise of Processual Archaeology (the "New Archaeology"). Reacting against the perceived limitations of culture-history, it advocated for a scientific, positivist model. Processualists sought to explain cultural change through the identification of universal laws, emphasizing cultural ecology, systems theory, and adaptation. This paradigm shifted the goal from reconstructing culture history to explaining process, employing explicit hypothesis-testing and quantitative methods to model past societies as functional, homeostatic systems interacting with their environment.
By the 1980s, a significant counter-movement, Postprocessual Archaeology, challenged Processualism's scientific objectivity and systemic determinism. Drawing from critical theory, hermeneutics, and structuralism, it argued for the centrality of human agency, meaning, and ideology. Postprocessualists contended that material culture is an active text to be interpreted, not merely a passive reflection of adaptive behavior. This school fragmented into multiple strands, including Marxist Archaeology, which foregrounded class conflict and historical materialism, and Feminist Archaeology, which critiqued androcentric narratives and explored gender as a social construct.
Parallel developments in the late 20th century included Behavioral Archaeology, which focused on the relationships between human behavior and material traces across all time, and Evolutionary Archaeology, which applied Darwinian selectionist models to cultural change. These frameworks maintained a commitment to scientific rigor but offered distinct methodological pathways from mainstream Processualism, often debating the units and mechanisms of cultural transmission and selection.
The current theoretical landscape is characterized by pluralism, with the central triad of Culture-Historical, Processual, and Postprocessual archaeology forming the foundational canon of methodological disagreement. Subsequent schools, including those emphasizing materiality, phenomenology, and symmetrical approaches, continue to engage with and critique this core lineage, ensuring that debates over epistemology, the nature of evidence, and the purpose of archaeological interpretation remain central to the discipline's identity.