Tree of Theories
How ideas connect
Browse and map major theories in physics, management information systems, sociology, psychology, economics, anthropology, philosophy, mathematics, logic, computer science, political science, and beyond—what each explains, and how one theory extends, replaces, or builds on another.
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231 result(s)
Theories view
Theory of Forms Metaphysics
Reality consists of eternal, perfect Forms; the sensible world is an imperfect copy accessible through reason.
Aristotelian Syllogistic Logic Classical Logic
Valid inference is analyzed through categorical propositions and syllogisms relating terms such as all, some, and none.
Aristotelian Virtue Ethics Ethics
The good life is achieved through cultivated character virtues and practical wisdom in a flourishing community.
Axiomatic Method Foundations
Mathematical truth is established by deducing theorems from explicitly stated axioms using rules of inference.
Euclidean Geometry Geometry
Plane and solid geometry deduced from axioms and postulates, especially the parallel postulate, using logical proof.
Stoic Propositional Logic Classical Logic
Compound statements are analyzed through connectives such as if, and, or, and not, focusing on truth-bearing propositions.
Mathematical Platonism 360 Philosophy Of Mathematics
Mathematical objects exist independently of human minds; theorems discover rather than invent abstract reality.
Kepler's Laws of Planetary Motion 1619 Astronomy
Planets move in ellipses with the Sun at one focus; areas swept in equal times are equal; orbital period scales with semi-major axis.
Galilean Relativity 1632 Classical Mechanics
The laws of mechanics are the same in all inertial reference frames; there is no absolute state of rest.
Cartesian Dualism 1641 Philosophy Of Mind
Mind and body are distinct substances—thinking res cogitans and extended res extensa—interacting yet ontologically separate.
Rationalism 1641 Epistemology
Some knowledge—especially of mathematics, logic, and metaphysics—is gained through reason independently of sensory experience.
Social Contract Theory 1651 Political Philosophy
Legitimate political authority arises from agreement—actual or hypothetical—among individuals to surrender some freedom for order and rights.
Infinitesimal Calculus 1684 Analysis
Continuous change is analyzed through derivatives and integrals, linking instantaneous rates to accumulated totals.
Newtonian Gravitation 1687 Gravitation
Every mass attracts every other mass with a force proportional to the product of their masses and inversely proportional to the square of their separation.
Newtonian Mechanics 1687 Classical Mechanics
Motion is described by three laws relating force, mass, and acceleration in absolute space and time.
British Empiricism 1689 Epistemology
All ideas originate in experience; knowledge is built from sensation and reflection, not innate concepts.
Graph Theory 1736 Discrete Mathematics
Networks of vertices and edges model relations, paths, and connectivity without metric geometry.
Bayes' Theorem 1763 Probability
Posterior probabilities update prior beliefs according to new evidence via a ratio of likelihoods and marginals.
Classical Political Economy 1776 Classical
Markets coordinate specialization through self-interest and competition, enlarging wealth via the division of labor and free trade.
Kantian Transcendental Idealism 1781 Epistemology
Experience is structured by a priori categories of the mind; we know phenomena as they appear, not things-in-themselves.
Kantian Deontology 1785 Ethics
Morality rests on duty to universalizable maxims and respect for persons as ends in themselves, not consequences alone.
Lagrangian Mechanics 1788 Classical Mechanics
Dynamics follows from a single scalar function—the Lagrangian—via the principle of least action.
Liberal Internationalism 1795 International Relations
Democracies, trade, and international law reduce war and enable cooperative global governance.
Hegelian Dialectics 1807 Metaphysics
History and thought advance through contradictions resolved in higher syntheses— thesis, antithesis, synthesis.
Balance of Power Theory 1814 International Relations
States form alliances and arm to prevent any single actor from dominating the system.
Theory of Comparative Advantage 1817 International Trade
Countries gain from trade by specializing in goods they produce at relatively lower opportunity cost, even if one nation is more efficient in everything.
Real Analysis 1821 Analysis
Calculus is rigorized through limits, continuity, and the epsilon-delta definition of convergence.
Non-Euclidean Geometry 1829 Geometry
Geometries consistent with Euclid's axioms except the parallel postulate describe curved and hyperbolic spaces.
Group Theory 1832 Algebra
Symmetry is captured by sets with an associative operation, identity, and inverses; groups classify solvability and invariants.
Hamiltonian Mechanics 1834 Classical Mechanics
A reformulation using position and momentum in phase space, governed by the Hamiltonian energy function.
Dialectical Materialism 1845 Political Philosophy
Material conditions and class struggle drive historical change; ideology reflects economic relations rather than pure ideas.
Class Struggle Theory 1848 Conflict Tradition
History progresses through conflict between classes with opposed interests over ownership and control of production.
Historical Materialism 1848 Conflict Tradition
Social change is driven primarily by material conditions and contradictions in modes of production, not ideas alone.
Thermodynamics 1850 Thermodynamics
Macroscopic laws governing heat, work, energy, and entropy in equilibrium and irreversible processes.
Boolean Algebra 1854 Symbolic Logic
Logical operations are represented algebraically with values 0 and 1, enabling systematic manipulation of classes and propositions.
Riemannian Geometry 1854 Mathematical Physics
Geometry on curved manifolds defined by a metric tensor, generalizing Euclidean space.
Utilitarianism 1863 Ethics
The right action maximizes overall happiness or utility, often summed as the greatest good for the greatest number.
Classical Electromagnetism 1865 Electromagnetism
Electric and magnetic fields unified by Maxwell's equations, predicting waves that propagate at the speed of light.
Marxian Economics 1867 Heterodox
Capitalist economies are driven by surplus value, class conflict, and crises rooted in exploitation and accumulation.
Statistical Mechanics 1870 Thermodynamics
Thermodynamic behavior emerges from statistical ensembles of many microscopic constituents.
Marginal Utility Theory 1871 Microeconomics
Value is determined at the margin: the utility of the last unit consumed governs prices and demand.
Set Theory 1874 Foundations
Mathematical objects are collections called sets; transfinite cardinalities extend arithmetic to infinity.
Social Evolutionism 1877 Historical Theories
Human societies progress through universal stages—from savagery to barbarism to civilization—reflecting growing rationality and complexity.
Pragmatism 1878 American Philosophy
The meaning and truth of ideas lie in their practical consequences and success in inquiry and action.
Predicate Logic 1879 Symbolic Logic
Quantifiers (∀, ∃) and predicates express relations and generality beyond what propositional logic can capture.
Peano Axioms 1889 Foundations
Natural numbers are defined by zero, successor, and induction axioms, providing a rigorous base for arithmetic.
Functionalism 1890 Schools Of Thought
Mental processes should be studied by their adaptive functions—how they help organisms survive and act in the world.
Neoclassical Economics 1890 Microeconomics
Prices and quantities equilibrate where marginal benefit equals marginal cost; agents maximize utility or profit subject to constraints.
Theory of Social Solidarity 1893 Classical Sociology
Social cohesion arises through shared norms and interdependence; societies shift from mechanical to organic solidarity as division of labor grows.
Topology 1895 Geometry
Properties preserved under continuous deformation—connectivity, holes, compactness—are studied independently of distance.
Historical Particularism 1896 American Anthropology
Each culture has a unique history; similarities arise from diffusion and local context, not inevitable universal stages.
Anomie Theory 1897 Classical Sociology
Normlessness and weak regulation during rapid social change produce deviance, suicide, and social disintegration.
Analytic Philosophy 1898 Analytic Tradition
Philosophical problems yield to logical analysis of language, concepts, and argument rather than grand speculative systems.
Hilbert's Formalism 1900 Foundations
Mathematics is manipulation of symbols according to rules; consistency proofs secure the validity of formal systems.
Phenomenology 1900 Continental
Philosophy must describe structures of lived experience as they appear to consciousness, bracketing unexamined assumptions.
Planck's Quantum Hypothesis 1900 Quantum Mechanics
Energy is exchanged in discrete quanta proportional to frequency, resolving the ultraviolet catastrophe in blackbody radiation.
Psychoanalysis 1900 Psychodynamic
Behavior and symptoms are shaped by unconscious conflicts, early experience, and defensive processes.
Classical Conditioning 1902 Learning
Neutral stimuli paired with reflex-eliciting events acquire the power to trigger learned responses.
Measure Theory 1902 Analysis
Generalized notions of size and integration assign consistent volumes to complicated sets and functions.
Verstehen (Interpretive Sociology) 1904 Classical Sociology
Social action must be understood through the meanings actors attach to their behavior, not only external causes.
Protestant Ethic Thesis 1905 Classical Sociology
Calvinist ascetic values unintentionally fostered the spirit of capitalism by legitimizing disciplined worldly labor and reinvestment.
Special Relativity 1905 Relativity
Space and time form a four-dimensional spacetime; the speed of light is invariant and mass–energy are equivalent.
Classical Management Theory 1911 Organizational Theory
Organizations achieve efficiency through standardized tasks, clear hierarchy, and rational division of labor.
Elite Theory of Democracy 1911 Comparative Politics
Political power concentrates in organized minorities; mass publics are largely apathetic or manipulated.
Gestalt Psychology 1912 Schools Of Thought
The whole of experience is more than the sum of its parts; perception and cognition organize into meaningful patterns.
Behaviorism 1913 Schools Of Thought
Psychology should study observable behavior and environmental contingencies, not private mental states.
Bohr Model of the Atom 1913 Quantum Mechanics
Electrons occupy discrete orbital energies; transitions emit or absorb photons with quantized energy.
General Relativity 1915 Relativity
Gravity is the curvature of spacetime caused by energy and momentum; free fall is geodesic motion.
Austrian Economics 1920 Heterodox
Markets are discovery processes; dispersed knowledge and entrepreneurship outperform central planning.
Many-Valued Logic 1920 Non Classical Logic
Truth values beyond true and false—such as a third value for indeterminacy—model vagueness and future contingents.
Proof Theory 1920 Meta Logic
Formal proofs themselves become mathematical objects studied for consistency, normalization, and structural properties.
Functionalism in Anthropology 1922 British Anthropology
Cultural institutions satisfy basic human needs—biological, psychological, and social—in integrated ways.
Participant Observation 1922 Methodology
Immersion in daily life yields knowledge of culture from the insider's perspective, not just informant interviews.
Theory of Bureaucratic Authority 1922 Organizations
Modern organizations run on rational-legal authority, hierarchy, written rules, and specialized roles—the 'iron cage' of bureaucracy.
Wave–Particle Duality 1924 Quantum Mechanics
Matter and light exhibit both wave-like and particle-like behavior depending on the experiment.
Pauli Exclusion Principle 1925 Quantum Mechanics
No two identical fermions can occupy the same quantum state simultaneously.
Quantum Mechanics 1925 Quantum Mechanics
Physical states are described by wave functions or operators; measurement yields probabilistic outcomes.
Schrödinger Equation 1926 Quantum Mechanics
The time evolution of a quantum wave function is governed by a linear partial differential equation.
Big Bang Cosmology 1927 Cosmology
The universe expanded from a hot, dense state; cosmic expansion and the cosmic microwave background support this model.
Heisenberg Uncertainty Principle 1927 Quantum Mechanics
Conjugate variables such as position and momentum cannot both be known with arbitrary precision simultaneously.
Cultural Relativism 1928 Theoretical Frameworks
Beliefs and practices must be understood within their own cultural context, not judged by external standards.
Logical Positivism 1928 Philosophy Of Science
Only empirically verifiable or logically tautological statements are meaningful; metaphysics is cognitively empty.
Minimax Theorem 1928 Game Theory
Two-person zero-sum games have optimal mixed strategies with a well-defined value given by minimax equilibrium.
Gödel's Completeness Theorem 1929 Meta Logic
In first-order logic, every logically valid formula is provable; syntactic derivability matches semantic validity.
Sapir–Whorf Hypothesis 1929 Linguistic Anthropology
Language structure influences cognition and perception; speakers of different languages may organize experience differently.
Intuitionistic Logic 1930 Non Classical Logic
Truth requires constructive proof; the law of excluded middle and double negation elimination are rejected in general.
Quantum Field Theory 1930 Particle Physics
Particles are excitations of underlying quantum fields; interactions are mediated by force-carrying fields.
Gödel's Incompleteness Theorems 1931 Logic
Any consistent formal system strong enough for arithmetic contains true statements that cannot be proved within the system.
Probability Theory 1933 Probability
Random phenomena are modeled as events in a sample space with a probability measure satisfying axioms of additivity.
Tarski's Definition of Truth 1933 Semantics
Truth for formal languages is defined recursively in a metalanguage, satisfying material and formal correctness conditions.
Culture and Personality Theory 1934 Psychological Anthropology
Culture shapes personality types and child-rearing patterns, which in turn reproduce cultural configurations.
Falsificationism 1934 Philosophy Of Science
Scientific theories are distinguished by risky predictions that could be refuted; confirmation alone cannot verify universal claims.
Natural Deduction 1934 Proof Systems
Proofs mirror informal reasoning with introduction and elimination rules for connectives and quantifiers.
Sequent Calculus 1934 Proof Systems
Logical derivations manipulate sequents—configurations of assumptions and conclusions—under structural and logical rules.
Symbolic Interactionism 1934 Micro Sociology
People create and negotiate social reality through symbols, gestures, and shared meanings in interaction.
Vygotsky's Sociocultural Theory 1934 Developmental
Cognitive development is driven by social interaction, language, and culturally mediated tools within the zone of proximal development.
Structural Functionalism in Anthropology 1935 British Anthropology
Social institutions maintain equilibrium through interdependent roles and norms that sustain the social structure.
Church–Turing Thesis 1936 Computability
Every effectively computable function is computable by a Turing machine—or equivalently, by lambda calculus or recursive functions.
Keynesian Economics 1936 Macroeconomics
Aggregate demand drives output and employment; markets can remain depressed without active fiscal and monetary policy.
Piaget's Theory of Cognitive Development 1936 Developmental
Children actively construct knowledge through stages—from sensorimotor to formal operations—via assimilation and accommodation.
Tarski's Logical Consequence 1936 Philosophy Of Logic
A sentence follows logically from premises if it is true in every model in which those premises are true.
Turing Machine Theory 1936 Computability
Computation is modeled as a finite-state controller operating on an infinite tape, defining mechanical procedure with mathematical precision.
Transaction Cost Economics 1937 Economics Of Is
Firms and IT investments exist to economize on the costs of coordinating, searching, and enforcing exchanges.
Transaction Cost Theory 1937 Institutional
Firms exist to economize on the costs of searching, bargaining, and enforcing contracts in markets.
Operant Conditioning 1938 Learning
Voluntary behavior is shaped by its consequences—reinforcement increases behavior; punishment decreases it.
Strain Theory 1938 Deviance
Deviance arises when culturally prescribed goals are unattainable through legitimate means, especially under anomie.
Type Theory 1940 Foundations
Objects are stratified into types to block paradoxes; functions are typed maps between types.
Schumpeterian Creative Destruction 1942 Growth
Capitalism advances through innovation that destroys old industries and reallocates resources to new combinations.
Existentialism 1943 Continental
Existence precedes essence; individuals create meaning through choice, freedom, and confrontation with anxiety and mortality.
Humanistic Psychology 1943 Schools Of Thought
People strive toward self-actualization; growth requires unconditional positive regard, authenticity, and fulfillment of hierarchical needs.
Category Theory 1945 Foundations
Mathematical structures and structure-preserving maps are studied through objects, morphisms, and functors.
Von Neumann Architecture 1945 Computer Architecture
Programs and data share memory; a CPU fetches and executes instructions sequentially—the stored-program model.
Critical Theory 1947 Critical Tradition
Social theory should critique domination, ideology, and distorted communication to emancipate human potential.
Linear Programming 1947 Optimization
Optimal values of linear objective functions subject to linear constraints are found efficiently via simplex or interior-point methods.
Classical Realism 1948 International Relations
International politics is driven by human nature, power, and national interest; morality is subordinate to survival and security.
Information Theory 1948 Applied Mathematics
Information content is quantified in bits; channel capacity sets limits on reliable communication over noise.
Alliance Theory of Kinship 1949 Kinship
Marriage rules exchange women between groups, creating alliances that structure social organization.
Middle-Range Theory 1949 Theoretical Frameworks
Sociology advances through theories of specific phenomena—not grand unified systems alone—that link concrete observations to general propositions.
Erikson's Psychosocial Development 1950 Developmental
Identity unfolds across the lifespan through eight crises, each balancing a psychosocial virtue against its pathology.
Game Theory 1950 Microeconomics
Strategic interaction is analyzed through players, strategies, payoffs, and equilibrium concepts such as Nash equilibrium.
General Systems Theory 1950 Systems Thinking
Organizations and information systems are open systems with interdependent parts, inputs, outputs, and feedback loops.
Model Theory 1950 Meta Logic
Formal languages are interpreted in structures; truth, validity, and definability are studied via mathematical models.
Socio-Technical Systems Theory 1951 Socio Technical Systems
Work systems must jointly optimize social and technical subsystems rather than technology alone.
Structural Functionalism 1951 Theoretical Frameworks
Society is a system of interrelated parts whose functions maintain stability, order, and collective goals.
Ordinary Language Philosophy 1953 Philosophy Of Language
Philosophical confusion arises from misusing everyday language; careful attention to ordinary usage dissolves pseudo-problems.
Conflict Theory 1954 Theoretical Frameworks
Society is organized around inequality and power; conflict over scarce resources drives social change.
General Equilibrium Theory 1954 Microeconomics
All markets clear simultaneously; prices coordinate the plans of consumers and firms across the entire economy.
Formal Language Theory 1956 Theory Of Computation
Languages are classified by grammar type—regular, context-free, context-sensitive, recursively enumerable—each matching an automaton class.
Pluralist Democratic Theory 1956 Comparative Politics
Democracy is competition among organized interests; dispersed groups prevent permanent domination by any single elite.
Symbolic AI (GOFAI) 1956 Artificial Intelligence
Intelligence is manipulation of explicit symbols, rules, and search over knowledge representations.
Cognitive Dissonance Theory 1957 Social Psychology
Inconsistent cognitions produce psychological discomfort that motivates attitude change, rationalization, or avoidance.
Attribution Theory 1958 Social Psychology
People explain behavior by inferring causes—internal dispositions versus external situations—often with systematic bias.
Structuralism in Anthropology 1958 Theoretical Frameworks
Culture operates through deep binary oppositions and hidden rules—like grammar—underlying myths, kinship, and food customs.
Automata Theory 1959 Theory Of Computation
Abstract machines—finite automata, pushdown automata, Turing machines—classify languages by recognizing power.
Dramaturgical Analysis 1959 Micro Sociology
Social life is performance; individuals manage impressions through front stage, back stage, and roles.
Modal Logic 1959 Non Classical Logic
Operators for necessity and possibility extend classical logic to reason about possible worlds and constrained truth.
Modernization Theory 1959 Development
Economic development and urbanization foster middle classes and institutions that support liberal democracy.
Relevance Logic 1960 Non Classical Logic
Implication requires meaningful connection between antecedent and consequent, blocking irrelevant conditionals.
Scientific Realism 1960 Philosophy Of Science
Mature scientific theories approximately describe a mind-independent world; unobservable entities can be real.
Diffusion of Innovations 1962 Technology Adoption
New ideas spread through social networks over time, driven by adopter categories, channels, and perceived attributes.
Public Choice Theory 1962 Political Economy
Political actors—voters, bureaucrats, legislators—pursue self-interest, shaping policy outcomes and government failure.
Speech Act Theory 1962 Philosophy Of Language
Utterances do not merely describe but perform actions—promising, ordering, asserting—under conventional rules.
Chaos Theory 1963 Dynamical Systems
Deterministic systems can exhibit sensitive dependence on initial conditions, producing unpredictable yet structured aperiodic behavior.
Labeling Theory 1963 Deviance
Deviance is not a property of acts alone but an outcome of social reaction and the application of stigmatizing labels.
Monetarism 1963 Macroeconomics
Inflation is always and everywhere a monetary phenomenon; steady money growth stabilizes the economy better than fine-tuning.
Political Culture Theory 1963 Comparative Politics
Stable democratic governance depends on civic attitudes—trust, participation norms, and legitimacy—embedded in culture.
Higgs Mechanism 1964 Particle Physics
Gauge bosons acquire mass through interaction with a scalar field that condenses in the vacuum.
Collective Action Theory 1965 Political Economy
Rational individuals underprovide public goods because they can free-ride on others' contributions.
Computational Complexity Theory 1965 Complexity
Problems are classified by resources—time and space—required as input size grows, using asymptotic growth classes such as P and NP.
Concurrency Theory 1965 Systems
Parallel and interleaved processes are coordinated with mutual exclusion, semaphores, monitors, and message passing.
Operating System Theory 1965 Systems
OS kernels manage processes, memory, files, and devices through abstractions such as virtual memory, scheduling, and protection.
Dependency Theory 1966 Political Economy
Underdevelopment in the Global South is produced by exploitative integration into a capitalist world economy, not internal backwardness.
Social Constructionism 1966 Sociology Of Knowledge
What we experience as reality is produced and maintained through habitualized interaction and institutionalization.
Cognitive Psychology 1967 Cognition
Mind is an information-processing system with structures such as attention, memory, and problem-solving.
Contingency Theory 1967 Organizational Theory
There is no one best way to organize; structure and IS design must fit environmental uncertainty and task characteristics.
Electroweak Theory 1967 Particle Physics
Electromagnetism and the weak nuclear force unify at high energies into a single electroweak interaction.
Functionalism in Philosophy of Mind 1967 Philosophy Of Mind
Mental states are defined by their causal roles in input, output, and other states, not by their material substrate.
Attachment Theory 1969 Developmental
Infants form evolved attachment bonds with caregivers; early security shapes exploration, emotion regulation, and later relationships.
Liminality and Rites of Passage 1969 Ritual Studies
Rituals move participants through transitional phases—separation, liminality, incorporation—transforming social status and identity.
Efficient Market Hypothesis 1970 Finance
Asset prices reflect all available information; consistent excess returns are hard to earn without additional risk.
Relational Data Model 1970 Databases
Data is organized in relations (tables) manipulated through relational algebra and declarative queries.
Software Engineering Lifecycle Theory 1970 Software Engineering
Large software is built through disciplined phases—requirements, design, implementation, testing, maintenance—with managed complexity.
Justice as Fairness 1971 Political Philosophy
Just social institutions are those free and equal persons would choose behind a veil of ignorance, prioritizing basic liberties and fair equality of opportunity.
NP-Completeness Theory 1971 Complexity
Hardest problems in NP are polynomial-time equivalent; if one has a fast solution, all NP problems do.
Habitus and Field Theory 1972 Social Inequality
Social positions internalize as durable dispositions; struggles in social fields reproduce inequality through cultural and economic capital.
Rational Expectations Theory 1972 Macroeconomics
Agents use all available information and correct models, limiting systematic exploitation of policy surprises.
Hegemonic Stability Theory 1973 International Relations
Open international economic and security orders require a dominant power willing to provide public goods.
Interpretive Anthropology 1973 Symbolic Anthropology
Culture is a web of meanings; ethnography provides 'thick description' of how people interpret symbols and actions.
Postcolonial Anthropology 1973 Critical Anthropology
Ethnographic knowledge is entangled with colonial power; anthropology must critique its own complicity and representational violence.
Social Network Theory 1973 Network Analysis
Social structure is patterns of ties between actors; network position shapes information, resources, and opportunities.
Standard Model of Particle Physics 1973 Particle Physics
A gauge theory describing quarks, leptons, and three fundamental forces—electromagnetic, weak, and strong—excluding gravity.
Layered Network Architecture 1974 Networking
Network functions are decomposed into layers—link, network, transport, application—with protocols at each level.
World-Systems Theory 1974 Political Economy
The modern world economy is a hierarchical system with core, semi-periphery, and periphery zones linked by unequal exchange.
Agency Theory 1976 Institutional
When principals delegate to agents, misaligned incentives and hidden information require contracts, monitoring, and bonding.
Cognitive Behavioral Theory 1976 Clinical
Emotional distress is maintained by maladaptive thoughts and behaviors that can be identified and changed through structured intervention.
Paraconsistent Logic 1976 Non Classical Logic
Contradictions need not trivialize a theory; some inconsistent systems remain non-trivial and useful.
Principal–Agent Theory 1976 Organizational Theory
When owners delegate to managers, information asymmetry and divergent incentives require monitoring and control mechanisms.
Public-Key Cryptography 1976 Security
Separate encryption and decryption keys enable secure communication without a shared secret channel.
Biopsychosocial Model 1977 Health Psychology
Health and illness arise from interacting biological, psychological, and social factors—not biology alone.
Political Process Theory 1977 Social Movements
Social movements succeed when political opportunities, mobilizing structures, and framing align to challenge elites.
Practice Theory in Anthropology 1977 Theoretical Frameworks
Culture is reproduced through everyday practice; habitus and strategy link structure and individual action.
Social Learning Theory 1977 Learning
People learn by observing models, imitating behavior, and expecting outcomes—mediated by attention, retention, reproduction, and motivation.
Distributed Systems Theory 1978 Distributed Systems
Independent nodes coordinate via message passing, clocks, and replication to provide scalable, fault-tolerant services.
Cultural Materialism 1979 Theoretical Frameworks
Infrastructure—technology, environment, and population—primarily shapes structure and superstructure, including ideas and rituals.
Human Behavioral Ecology 1979 Evolutionary Anthropology
Human behavior is analyzed as adaptive strategy under ecological constraints, using optimization and evolutionary logic.
Porter's Five Forces 1979 Strategic Management
Industry profitability is shaped by rivalry, supplier power, buyer power, substitutes, and entry barriers.
Prospect Theory 1979 Behavioral
People evaluate gains and losses relative to a reference point and overweight small probabilities, violating expected utility.
Social Identity Theory 1979 Social Psychology
Self-concept derives partly from group membership; people favor in-groups and derogate out-groups to maintain positive identity.
Structural Realism (Neorealism) 1979 International Relations
The international system's anarchic structure—not human nature alone—pressures states toward balance of power and self-help.
Default Logic 1980 Non Monotonic Logic
Reasoning with defeasible assumptions allows conclusions to be withdrawn when new exceptions appear.
Trait Theory of Personality 1980 Personality
Personality consists of relatively stable dimensions—such as the Big Five—that predict behavior across situations.
Byzantine Fault Tolerance 1982 Distributed Systems
Distributed replicas reach consensus despite arbitrary failures or malicious behavior by some nodes.
ACID Transaction Theory 1983 Databases
Database transactions guarantee Atomicity, Consistency, Isolation, and Durability despite failures and concurrency.
Institutional Theory in IS 1983 Organizational Theory
Organizations adopt IS practices partly to gain legitimacy and conform to norms, not only for efficiency.
Neoliberal Institutionalism 1984 International Relations
International institutions reduce transaction costs and enable cooperation even among self-interested states in anarchy.
New Institutionalism in Political Science 1984 Institutional Analysis
Rules, norms, and organizational routines shape political behavior beyond short-term rational calculation.
PAC Learning Theory 1984 Machine Learning
A learner probably approximately correctly identifies a target concept from samples in polynomial time with high confidence.
Resource-Based View 1984 Strategic Management
Sustained advantage comes from valuable, rare, inimitable, and non-substitutable organizational resources.
Structuration Theory 1984 Theoretical Frameworks
Structure and agency are mutually constitutive; rules and resources are produced and reproduced through social practice.
State Autonomy Theory 1985 Comparative Politics
States can pursue interests distinct from dominant social classes, especially through bureaucratic capacity and geopolitical pressure.
Connectionist Machine Learning 1986 Machine Learning
Learning emerges from networks of simple units adjusting weights via backpropagation and distributed representations.
Democratic Peace Theory 1986 International Relations
Mature democracies rarely fight one another, though they may still war with non-democracies.
Endogenous Growth Theory 1986 Growth
Long-run growth is driven by internal factors—human capital, innovation, and knowledge spillovers—not exogenous technology alone.
Reflexive Anthropology 1986 Critical Anthropology
Ethnographic texts are partial constructions; the anthropologist's position and narrative choices must be examined openly.
Feminist Sociology 1987 Gender Studies
Gender is a central organizing principle of social life; knowledge must address women's standpoints and intersecting inequalities.
Linear Logic 1987 Substructural Logic
Formulas are resources consumed in proof; contraction and weakening are restricted to track use and cost.
Two-Level Games Theory 1988 International Relations
International negotiators must satisfy both foreign partners and domestic constituencies whose ratification is required.
Technology Acceptance Model (TAM) 1989 Technology Adoption
Perceived usefulness and perceived ease of use predict individual intentions to use an information system.
Business Process Reengineering 1990 Process Management
Radical redesign of core processes—not incremental improvement—enabled by IT can deliver order-of-magnitude performance gains.
Description Logic 1990 Applied Logic
Concepts, roles, and individuals are represented in decidable fragments of first-order logic suited to knowledge bases.
New Institutional Economics 1990 Institutional
Institutions—rules, norms, enforcement—shape transaction costs and long-run economic performance.
Rational Choice Sociology 1990 Theoretical Frameworks
Social outcomes can be modeled as the aggregate result of actors pursuing preferences under constraints.
Technology–Organization–Environment Framework 1990 Is Adoption
Technology adoption at the organizational level is shaped by technological context, organizational context, and environmental context.
DeLone & McLean IS Success Model 1992 Is Evaluation
IS success is multidimensional: system quality, information quality, service quality, use, satisfaction, and net benefits.
Evolutionary Psychology 1992 Evolutionary
Psychological mechanisms evolved to solve recurrent adaptive problems faced by ancestral humans.
Structuration Theory in IS 1992 Socio Technical Systems
Technology and organization mutually constitute each other through ongoing practices that produce and reproduce structure.
Knowledge Management Theory 1995 Knowledge Systems
Organizations create value by converting tacit and explicit knowledge through socialization, externalization, combination, and internalization.
Multisited Ethnography 1995 Methodology
Culture and power traverse linked sites; fieldwork follows chains, biographies, and conflicts across locations.
Statistical Learning Theory 1995 Machine Learning
Generalization bounds relate training error, model capacity, and risk minimization in high-dimensional learning.
Task–Technology Fit 1995 Is Use
Performance gains occur when IT functionality aligns with the requirements of the tasks users perform.
Dynamic Capabilities 1997 Strategic Management
Firms sustain advantage by sensing opportunities, seizing them, and reconfiguring resources in changing environments.
Securitization Theory 1998 International Relations
Issues become security threats through speech acts that claim existential urgency and justify extraordinary measures.
Constructivism in International Relations 1999 International Relations
International structures and state interests are shaped by shared ideas, norms, and identities—not material power alone.
CAP Theorem 2000 Distributed Systems
Distributed systems cannot simultaneously guarantee consistency, availability, and partition tolerance—only two of the three.
Path Dependence Theory 2000 Institutional Analysis
Early institutional choices lock in trajectories; switching costs and increasing returns make history matter.
Veto Players Theory 2002 Comparative Politics
Policy change becomes harder as the number and ideological distance of veto players—actors who must agree—increase.
Dual-Process Theory 2003 Cognition
Judgment and decision-making involve two systems: fast, intuitive processing and slow, deliberative reasoning.
Selectorate Theory 2003 Political Economy
Leaders stay in power by distributing goods to winning coalitions; regime type depends on selectorate and winning coalition size.
Unified Theory of Acceptance and Use of Technology (UTAUT) 2003 Technology Adoption
Performance expectancy, effort expectancy, social influence, and facilitating conditions explain usage, moderated by gender, age, experience, and voluntariness.
Behavioral Economics 2008 Behavioral
Economic behavior systematically deviates from perfect rationality; institutions and nudges can improve choices.
Deep Learning Theory 2012 Machine Learning
Hierarchical neural architectures learn representations at multiple levels, enabling end-to-end training on large data with GPUs.