Hello friend,

The way you think matters as much as what you know.

That’s where mental models come in handy. These frameworks let you see the world more clearly, move faster, and make fewer mistakes.

Today, I’m giving you a lineup of 26 models to keep handy as you plan, build, and upgrade your life in 2026.

Start by stripping away assumptions and breaking a problem down to its fundamental facts or physical laws.

Instead of copying what’s been done, ask: what’s actually necessary here? This is why many breakthroughs start with “does it have to be this way?”

Rather than focusing only on how to achieve a goal, consider the opposite: “How could this go wrong?” or “How might I fail?” This reversal makes blind spots visible and helps you avoid preventable mistakes.

Don’t just plan to succeed. Also plan to avoid failure.

Always include extra room in your plans. More time, more money, and more bandwidth than you think you need.

Surprises are inevitable.

Whether it’s engineering, investing, or project management, systems with a cushion tend not to break when things go off script.

Whenever you choose one thing, you’re giving up something else.

Weigh not only the benefit of what you’re doing, but what you have to sacrifice to do it.

This helps you prioritize high-value actions over busywork.

Tiny improvements, stacked over time, can lead to explosive results.

Compound interest isn’t just a financial concept. It’s the hidden force behind lifelong learning and exponential change.

Most changes have ripple effects. The first consequence is rarely the last.

For every decision, ask: “And then what?”

Think through the follow-on impacts. Sometimes the side effects are more important to consider than the initial outcome.

When you’re faced with competing explanations or solutions, start with the simplest one that fits the facts.

Complexity often adds confusion and error. Simple models are easier to test and fix.

Every system feeds on its own output.

Positive feedback loops reinforce and accelerate; negative ones stabilize or erode.

Look for these cycles in your work and life, and learn to nudge them in the right direction.

Be honest about what you know well and what you don’t.

Play to your strengths and seek help or new knowledge where you’re weak. Avoid overconfidence reaching into areas where you’re guessing.

“Never attribute to malice that which is adequately explained by stupidity.”

Don’t assume bad outcomes are caused by evil intent. Often, they’re the result of oversight, ignorance, or accident. This mindset prevents overreacting and keeps relationships intact.

If you only study winners, you miss lessons from those who didn’t make it. Whether in business, sports, or science, always look at the full population.

Failure stories are rich with warning signs.

People (including you) are driven by what gets rewarded.

Incentives shape actions, sometimes in unexpected ways. Before you blame character, examine the reward structure.

Set up incentives to drive the behaviors you actually want.

It’s tempting to keep pouring resources into something just because you already invested a lot. But past costs are gone.

Evaluate decisions based on future potential, not emotional attachment to what you’ve already spent.

Extreme outcomes tend to be followed by more average ones. When you see an outlier, good or bad, don’t assume it’s a permanent change.

Wait for a few cycles before rewriting your plans.

The world runs on probabilities, not certainties.

Assign likelihoods to outcomes, make bets accordingly, and adjust as you get new information.

Thinking in probabilities makes you less reactive and more adaptive.

Early efforts yield the most impact. Subsequent ones deliver less and less.

Know when to stop tweaking and move on. Whether you’re studying for a test, optimizing a workflow, or adding features to a product, there’s a point where your time would be better spent elsewhere.

Every model, spreadsheet, or framework is a simplification of reality, not reality itself.

Models are useful, but beware mistaking them for the thing they represent. Keep questioning and updating as you go.

Work will balloon to fill the time you give it. Set shorter deadlines to force focus and efficiency.

Tasks that seem big often shrink under time pressure.

“Ninety percent of everything is crud.”

Most ideas, products, and solutions aren’t very good. Don’t be discouraged by the many. Keep looking for the worthwhile few.

Roughly 80% of outcomes come from 20% of causes.

Find the small set of actions or clients that drive most of your results, and focus there for leverage.

A scarcity mindset hoards resources and worries about loss. An abundance mindset looks for new possibilities and growth.

Use both. Scarcity for risk management, abundance for innovation.

When new evidence shows up, update your beliefs instead of sticking to old assumptions.

Over time, this makes your decisions more accurate and less brittle.

Organizations often unconsciously resist solving the problem they were created to address.

Sometimes the system protects itself over its mission. Be skeptical of institutional inertia.

If something has lasted a long time, whether a book, idea, or tradition, it’s likely to endure much longer.

Don’t ignore things just because they’re old.

Sort your tasks by urgency and importance.

High performers spend more time on important-but-not-urgent tasks, building systems and relationships that prevent future fires.

Progress often comes not from wild leaps, but from moving to the next thing that’s just barely within reach.

Explore the boundaries of what’s already working. You’ll find innovation right on the edge.

Tool: Fantasy Visualizer

Prompt: Royal subjects playing chess with highly decorative pieces in a beautiful medieval study.

It does seem to be a struggle to create an actual game of chess using current AI image modeling tools. It looks fine at first, but upon closer inspection the pieces don’t actually make sense. I still wanted to share anyways to illustrate a current limitation.

Got a second? Give some feedback on today’s article so we can keep making improvements to The Manifold.

PS—If you liked this post, Levers is going to be on another level.