Definition
A mental model is a working diagram of cause and effect — small enough to steer today, honest enough to update when reality disagrees.
Origin
Cognitive science. Mental models (Johnson-Laird; later popularised in decision-making literature) are internal simulations used to predict outcomes. Charlie Munger’s “lattice of mental models” stresses multiple models for the same problem.
Systems thinking. Models can be glassbox (inspectable cause chain) or blackbox (output-only). Personal-architecture work tends toward glassbox — see The Glassbox Mindset.
Mechanism
Good models share traits:
- Falsifiable — one observation could disprove them this week.
- Action-linked — they change a lead measure, not only a story.
- Bounded — they claim one domain (sales, energy, marriage), not everything.
Bad models collapse into heuristics — frozen sentences mistaken for identity (“I always fail prep”).
Applications
Name which model you are using before debating emotion — doctrine operational sets live in Signal vs Noise and Master of Opposites; Atlas holds neutral frames from books and training.
Sources
Cite
- Johnson-Laird, P. N. (1983). Mental models: Towards a cognitive science of language, inference, and consciousness. Cambridge University Press
- Doyle, J. K., & Ford, D. N. (1998). Mental models concepts for system dynamics research. System Dynamics Review, 14(1), 3–29