Lexicon
A working glossary of the concepts that recur across the Observatory. Use it to anchor meaning before the longer essays.
B
Boundary Conditions
The constraints that define where a model applies and where it fails.
Brittleness
A system's tendency to fail suddenly when a threshold is crossed.
C
Causal Mechanism
The chain of operations that produces an outcome.
Coherence
The degree to which an explanation holds together without contradiction.
Conceptual Clarity
A state where terms are stable, distinctions are sharp, and the model can be reasoned with.
Coordination Cost
The effort required to align many actors toward a shared goal.
E
Emergence
When a system shows properties that cannot be reduced to any single part.
Epistemic Closure
A state where a system filters out disconfirming evidence.
Epistemic Humility
A disciplined recognition of what you do not know. It keeps explanations provisional and makes room for error.
Explanatory Depth
The degree to which an explanation exposes underlying structure rather than surface description.
F
Falsifiability
The property of a claim that allows it to be tested and possibly proven wrong.
Feedback Loops
Circular causal paths that amplify or dampen behavior.
First Principles Thinking
A method that strips a problem down to irreducible facts and rebuilds from there.
I
Information Asymmetry
A condition where different actors have access to different information.
Instrumental Knowledge
Knowledge that works without necessarily explaining why.
L
Local vs Global Optima
A local optimum is best in a neighborhood; the global optimum is best overall.
M
Measurement Bias
When the act of measuring distorts the thing being measured.
Model vs Reality
A reminder that models are simplifications, not mirrors.
N
Narrative Compression
The act of condensing complex causality into a story.
P
Path Dependence
When early choices lock in later outcomes, even if better alternatives exist.
Phase Transition
A qualitative change that occurs when a system crosses a threshold.
R
Reductionism
The practice of explaining a system solely in terms of its parts.
Robustness
A system's ability to absorb shocks without losing its core function.
S
Scaling Law
A rule that describes how a system changes as it grows.
Second-Order Effects
Consequences that follow from the consequences.
Selection Pressure
Forces that favor certain behaviors or structures over others.
Sensemaking
The process of turning ambiguity into a coherent frame for action.
Signal vs Noise
The distinction between meaningful patterns and random variation.
Systems Mapping
A visual or conceptual representation of components and their relationships.
T
Tradeoff Surface
A way of describing unavoidable tensions between competing goals.
Social Technology
A repeatable method for coordinating behavior.