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Systems & Complexity
Mental models in the Systems & Complexity domain — frameworks for sharper thinking, better decisions, and a deeper understanding of how the world works.
When multiple cognitive biases or forces act in the same direction simultaneously, the combined effect isn't additive — it's multiplicative. Recognising these confluences is essential for predicting extreme outcomes.
AntifragilityBeyond resilience — some systems actually gain from disorder, volatility, and stress, growing stronger from the very shocks that destroy the fragile.
EmergenceComplex system-level properties that arise from simple interactions between individual components but cannot be predicted from those components alone.
Feedback LoopsCircular causal chains where the output of a system feeds back as input — either amplifying change (reinforcing) or stabilizing the system (balancing).
Gall's LawA complex system that works is invariably found to have evolved from a simple system that worked — you cannot design complexity from scratch.
Leverage (Systems)Places within a complex system where a small shift produces large changes — Meadows 12 leverage points from shallow parameters to deep paradigms.
Margin of Safety (Systems)Building redundancy, slack, and buffers into any system so it can absorb unexpected shocks — systems optimised for efficiency are structurally fragile.
ResilienceThe capacity of a system to absorb disturbance and reorganise while maintaining essential function — not bouncing back to the same state, but adapting forward.
Second-Order EffectsInterventions produce unintended downstream consequences that often dominate the intended first-order outcome — the consequences of consequences.
Stock and FlowEvery system is composed of stocks (accumulations) and flows (rates of change) — most people fixate on flows when stocks determine system behaviour.
Theory of ConstraintsEvery system has exactly one constraint at any given time — optimising anything other than the constraint is an illusion of progress.
AutomationBackup System ModelBreakpointsCausal Loops DiagramsChurnCounterparty RiskFail-safesFrictionHysteresisInterdependenceIrreducibilityLe Chatelier's PrincipleNormal AccidentsOptimizationParadox of AutomationQuality ControlRedundancyRefactoringReflexivitySlackStandard Operating ProcedureStress TestingThe Critical FewThe Experimental MindsetAnalytical HonestyBottlenecks (Systems)CessationChangeContextDeconstructionEnvironmentGarbage In Garbage OutHumanizationKPIMargin of ErrorMeasurementNormsProcess OverheadProgressive LoadRatioRenormalization GroupSelection TestSpring-LoadingSustainable Growth CycleThe Middle PathToleranceTypicalityUncertaintyLeverageForce multipliers that allow disproportionate output from a given input — labor, capital, and code/media as the three forms of leverage.