Mental Models Should Be Mixed and Matched
A single mental model gives you a lens. Two mental models give you depth perception. The most dangerous mistakes come from trusting one framework too completely.
"Avoid getting caught in your mental model by always keeping a couple mental models handy. Run the problem through one mental model, and then run it through a second mental model." Will Larson
Will Larson defines a mental model as "a structured view on a given topic" that lets you predict how changes propagate across a problem. The trap is that any single model, no matter how powerful, will be systematically wrong in specific ways. The solution is not to find the one perfect model but to run every problem through at least two different models and pay close attention when they disagree. Disagreement between models is not a bug it is where the most valuable learning lives.
This principle echoes across domains. Chet Richards, synthesizing Boyd's military strategy, describes "many-sided, implicit cross-referencing" slicing a problem multiple ways, drawing ideas from across disciplines, and looking for common patterns. Boyd connected the German Blitzkrieg to the Toyota Production System to Sun Tzu's Art of War not because they were superficially similar but because multiple analytical lenses converged on the same underlying principle: time-based competition. Larson's concept of multi-dimensional tradeoffs follows the same logic: two-dimensional tradeoffs always disappoint someone, but introducing a new dimension often resolves the tension entirely.
Nabeel Qureshi's advice to "imagine the strongest possible argument against" your position is the adversarial version of the same technique. In chess, weak players play "hope chess" they launch an attack and assume the opponent will cooperate. Strong players model the opponent's best response. Your brain actively resists this motion, but it is the single most powerful guard against self-deception.
Takeaway: Never trust a single mental model always run the problem through a second one, and investigate the disagreements.
See also: The Heilmeier Catechism for Evaluating Ideas | Avoid Ruin Above All | The Barbell Strategy Handles Uncertainty