Multidisciplinary thinking
Borrow the big ideas from every "101" course because no single discipline holds the answers.
A practical specification of the latticework idea. Munger's claim: the big ideas of any introductory course in physics, biology, math, psychology, economics, statistics, history are usually all you need to be dangerous. You don't need a PhD in any of them.
What you do need is the discipline to actually learn the basics of fields outside your own. Most professionals don't. The lawyer doesn't learn physics. The engineer doesn't learn psychology. The marketer doesn't learn statistics. Each is then helpless when a problem turns out to depend on the discipline they skipped.
The 80/20 of any field is shockingly small. Half a dozen big ideas from biology (evolution, niche, scale, feedback) explain most of what you'll see in nature. Half a dozen from economics (supply/demand, opportunity cost, marginal utility, comparative advantage) explain most of what you'll see in markets.
The discipline of learning these isn't about being well-rounded for its own sake. It's about not being the lawyer who confidently misuses the word "exponential" or the engineer who doesn't notice they're optimising the wrong human behaviour.
Examples in the wild
A new product launch needs the marketer (psychology), the financier (unit economics), the engineer (manufacturability), the lawyer (regulatory). Teams missing one of these reliably make one obvious mistake.
The best investors read very widely outside finance. Buffett reads biographies. Munger reads science and history. The extra reading is what produces the non-obvious calls.
When stuck on a problem, ask a friend from a completely different field. Their first instinct often reveals an angle you missed.
Multidisciplinary thinking is one of the mental models we apply through real cases inside the Pareto MBA — a part-time program for professionals who want to think clearly about business.