Welcome to the complete index of every article in our Principles Laws collection on When Notes Fly. This page lists all 29 articles in the section, organized alphabetically for easy reference. Each piece is researched, written by hand, and grounded in academic sources, professional practice, or empirical data. Whether you are diving into Principles Laws for the first time or returning to find a specific article, the index below gives you direct access to the full collection within Concepts.
If you are new to Principles Laws, we recommend starting with the foundational explainers and definitions before moving on to specific case studies, applied frameworks, and deeper analytical pieces. Articles are written for thoughtful readers who want substance over summary, with clear explanations of how ideas connect, where they come from, and why they matter. Use this index as a navigational map: skim the titles, read the short summaries, and click through to the pieces that draw your interest. Each article also links to related material so you can follow a thread of ideas across our entire Concepts library.
Campbell's Law states that the more a quantitative measure is used for high-stakes decisions, the more it corrupts the process it was meant to monitor. A principle that explains teaching to the test, metrics gaming, and the collapse of useful indi...
Chesterton's Fence: don't remove what you don't understand. From Mao's sparrow campaign that killed millions to Glass-Steagall's repeal causing the 2008 crisis — the principle that demands understanding before action.
Cognitive principles shaping decisions: bounded rationality from limited mental capacity, cognitive load that drains energy, and availability bias.
Theory of Constraints: Identify the bottleneck limiting system performance. Optimizing non-constraints wastes effort without improving throughput.
Conway's Law states that organizations design systems that mirror their own communication structures. A principle that explains why software architecture, product design, and technical debt all reflect org charts more than technical requirements.
Diminishing returns means more input yields less output over time. Supply and demand set prices. Opportunity cost is the next best alternative foregone.
First-order effects are immediate and obvious. Second-order effects are what happens next — often larger and opposite. Third-order effects reshape entire systems. Real examples from medicine, policy, business, and everyday decisions.
On September 26, 1983, Soviet Lt. Col. Stanislav Petrov watched five US missiles appear on his early warning screen. He chose not to retaliate — reasoning that a real attack would involve hundreds, not five. The system had a bug. Hanlon's Razor:...
On September 26, 1983, Soviet Lt. Col. Stanislav Petrov watched five US missiles appear on his early warning screen. He chose not to retaliate — reasoning that a real attack would involve hundreds, not five. The system had a bug. Hanlon's Razor:...
Hofstadter's Law states it always takes longer than you expect, even when you take into account Hofstadter's Law. A recursive principle explaining why planning fallacy is so persistent and so hard to correct.
Inversion is asking what guarantees failure instead of what guarantees success. Florence Nightingale cut mortality from 42% to 2% using it. Charlie Munger built Berkshire Hathaway with it. Here is how it works and why it is cognitively hard.
Occam's Razor holds that the simplest explanation with fewest assumptions is usually correct. Learn its origins, applications in science and AI, its limits, and how to apply it in decisions.
In 1914 the British Admiralty employed 2,000 officials to administer 62 ships. By 1928, the fleet had shrunk to 20 ships — but the Admiralty had grown to 3,569 officials. C. Northcote Parkinson's 1955 discovery: work expands to fill the time ava...
Rules fail when context changes, complexity increases beyond anticipation, or people game them by optimizing the rule instead of the intended goal.
Alfred Korzybski's principle: every model is an abstraction that omits, simplifies, and distorts. Long-Term Capital Management. The Gaussian copula and 2008. McNamara's body count. Why confusing maps for territory causes catastrophic failures.
Every choice sacrifices alternatives. Speed vs accuracy, cost vs quality, flexibility vs efficiency, growth vs stability. No perfect solution exists.
Pareto principle: 80% of effects come from 20% of causes. Leverage finds high-impact points. Feedback loops connect outputs to inputs across all systems.
Parkinson's Law states that work expands to fill the time available for its completion. Learn the 1955 origin, the evidence, and how to use it to get more done with less time.
Bikeshedding is the tendency for groups to spend disproportionate time on trivial issues while neglecting complex ones. Learn the origin, causes, and how to prevent it.
Rules tell you what to do; principles tell you how to think. Principles transfer across contexts while rules remain situation-specific.
Goodhart's Law states that when a measure becomes a target, it ceases to be a good measure. Learn how gaming metrics destroys value — and how to design better ones.
The cobra effect occurs when an incentive designed to fix a problem makes it worse. Learn the origin story, Goodhart's Law connection, and how to design better incentives.
The cobra effect occurs when an incentive designed to fix a problem makes it worse. Learn the origin story, Goodhart's Law connection, and how to design better incentives.
The Lindy Effect says non-perishable things that have survived longer are expected to survive longer still. Learn Taleb's formulation, applications, and limitations.
The Pareto Principle (80/20 rule) explained: its origins in Pareto's wealth research, power law distributions, real applications in business and software, and where the rule breaks down.
The Peter Principle states that employees rise to their level of incompetence. Learn the original theory, empirical evidence, and alternatives to hierarchical promotion.
The Peter Principle states that employees rise to their level of incompetence. Learn the original theory, empirical evidence, and alternatives to hierarchical promotion.
Laws break when context changes because they're context-dependent. Diversification reduces risk in stable markets but fails in correlated crises.
Tactics work until conditions change. Principles adapt because they're based on underlying truths, not surface patterns. Invest in principles, not tricks.