- ARITHMETIC (2) - The number of arithmetic operations needed in a computation
- AUTOMATA (26) - CAs, finite automata, Turing machines
- AXIOMS (12) - Axiomatic approaches to Complexity
- BIOLOGY (50) - Including ecology
- CHAOS (27) - Deterministic but unpredictable systems
- COGNITIVE (9) - Psycological measure of complexity of mental models
- COMPLEXITY (239) - Talks about Complexity
*per se*directly - COMPUTABILITY (12) - Turing machines, recusive function theory etc.
- COMPUTATIONAL (49) - Minimal asymptotic bounds for a computation of a problem
- CONNECTIVITY (8) - Usually graph connectivity
- CONTROL (5) - Control Complexity as opposed to observer complexity
- DECOMPOSABILITY (21) - Relation of decomposability to complexity
- DEPTH (19) - Depth of trees, language structures etc.
- DYNAMIC (3) - Dynamic as opposed to static measures of complexity
- ECOLOGY (8) - Ecology specific
- ECONOMIC (29) - In the widest sense of the term
- EFFECTIVE MEASURE (6) - The information contained in the regularities
- EMERGENCE (13) - Relation of emergence to complexity
- ENTROPY (36) - Entropy related measures of complexity
- EVOLUTION (30) - Relation of eveolution to complexity
- EXTRA-LOGICAL (3) - Simplicity measures based on extra-logical predicate signs
- FORMAL (3) - Formal expositions as opposed to philosophical approaches
- FUZZY (2) - Complexity approached through fuzzy Logic, set theory etc
- GAMES (5) - Relation of complexity to games and game theory
- GEOGRAPHY (1) - As Related to Geography
- GODEL (1) - Releation of incompleteness to complexity
- GRAPH (22) - Graph measures and graph theory perspectives
- GROUP (8) - Group (and semi-group etc.) related measures
- HIERARCHY (21) - Complexity in relation to heirarchy
- HOLISM (11) - Complexity as represented by undecomposable systems
- INFORMATION (54) - Information related measures of Complexity
- INTEGRATIVE (1) - Psycology - the complexity of integrating knowledge
- KOLMOGOROV (57) - Measures based on the length of minimal description
- LANGUAGES (24) - As realted to formal language theory
- LENGTH (9) - Measures based on length
- LOGIC (19) - As related to logic
- MARKOV CHAINS (3) - Complexity as related to Markov based statistics
- MATHS (32) - Contains a substantial mathematical element
- MATRIX (6) - Measures related to matricies (e.g. in logic)
- METRICS (6) - Software metrics
- MODELS (18) - Concerned with models as related to complexity
- MUTUAL INFORMATION (3) - The amount of shared information as a measure of complexity
- NETWORK (19) - Measures based on a network representation
- ORDER (8) - The relation of ordered and disordered complexity
- PARADIGM (15) - Complexity as a paradigm beyond Newtonian style science
- PHILOSOPHY (57) - Where the philosophy of complexity is discussed
- PHYSICS (43) - CAs, chaos, etc.
- PLANNING (1) - Complexity as related to planning matters
- PROBABILITY (5) - Probability related measures
- PROBLEM (1) - Complexity inherent in a problem
- PROOFS (3) - The complexity of proofs
- PSYCOLOGY (17) - cognitive, Interpretive, problem complexity etc.
- RANDOMNESS (9) - Randomness and its relation to complexity
- RELEVANCE (2) - Relevance as related via decomposability to complexity
- SCIENCE (110) - anything science related
- SELF-ORGANIZING (11) - Self-organisation as a source of complexity
- SEMANTIC (1) - Complexity as related to (philosophical) semantics
- SETS (1) - Set theoretic approaches
- SIMPLICITY (27) - Why you choose one theory over another when evidence is equal
- SIZE (32) - Measures based on numerosity
- SOCIAL (33) - Social science related
- SOFTWARE (21) - Measures of software complexity
- SOPHISTICATION (3) - A Kolomogorov related measure
- STABILITY (8) - Complexity as related to the stability (or otherwise) of systems
- STATES (2) - Measures based on the number of states
- STATISTICS (8) - Statistical approaches
- STRUCTURE (10) - Structure as related to complexity
- SYNTAX (5) - Syntactic approaches
- SYSTEMS (69) - Systems orientated approaches
- TREES (8) - Complexity as related to or modelled by tree structures
- VARIETY (4) - Measures based on the the amount of variety

Bruce Edmonds, Centre for Policy Modelling, Manchester Metropolitan University