This post is part of the 📖 Mental Models series.

Today, I am reading two mental models, 29 & 30th mental model Parkinson’s Laws from Oldies but Goodies: They’re Still Around for a Reason! chapter of the book Mental Models written by Author Peter Hollins.

TL;DR! 💬

Mental Models are like giving a treasure map to someone lost in the woods. They provide instant understanding, context, and most importantly, a path to the end destination. Now imagine having such a map for all problems and decisions in your life.

In this book Mental Models, author Peter Hollins discuss 30 mental models that billionaires/CEOs, Olympic athletes, and scientists use to think differently and avoid mistakes.

Battle information overwhelm, focus on what really matters, and make complex decisions with speed and confidence.

Yesterday, I finished reading the 28th mental model Sturgeon’s Law.

Chapter #5: Oldies but Goodies: They’re Still Around for a Reason!

The mental models in this last chapter develop more from observations of patterns found in real life, both small and significant. But within them are lessons that can transfer to how you live your life.

Mental Model #29, #30:

Parkinson’s Laws

Use to stop procrastinating and get more done in less time.

There are two laws under the Parkinson’s Laws.

  1. Parkinson’s Law of Triviality
  2. Parkinson’s Law

The first of these laws is called ** Parkinson’s Law of Triviality**, also known as the bike shed effect.

People are prone to overthinking and fixating on small details that don’t matter in the grand scheme of a task, and they do so to the detriment of more significant issues that have infinitely more importance.

There are two main reasons for this phenomenon.

1. Procrastination and Avoidance

When people want to procrastinate on an issue, they often try to remain productive by doing something perceived as productive.

This is why we clean when we are putting off work. We’re subconsciously avoiding the work but making ourselves feel better by thinking, “At least something productive got done!”

2. The Law of Triviality

It may be the result of individuals who wish to contribute in any way they can but find themselves unable to in all but the most trivial of matters.

When you devolve into small tasks that may not need tweaking or do not impact your overall goal, it’s time to take a break instead of pretending to be productive.

How to combat triviality?

  1. Have a strict agenda, whether it is your to-do list or calendar or other technique, so you know what you should focus on and what you should ignore.

  2. Know your overall goals for the day and constantly ask yourself if what you’re doing is contributing to them or avoiding them.

  3. Develop an awareness of when you’re starting to lose energy so you can preempt triviality from occurring.

Parkinson’s other law is simply known as Parkinson’s Law.

Parkinson’s Law states that work expands to fill the time available for its completion.

Parkinson observed that as bureaucracies expanded, their efficiency decreased instead of increased.

The more space and time people were given, the more they took—something that he realized and applied to a wide range of other circumstances.

A study of college students found that those who imposed strict deadlines on themselves for completing assignments consistently performed better than those who gave themselves an excessive amount of time and those who set no limits at all.


The artificial limitations they had set for their work caused them to be far more efficient than their counterparts.

Suppose you want to be more productive and efficient. In that case, you’ll have to avoid falling victim to Parkinson’s Law yourself by applying artificial limitations on the time you give yourself to complete tasks.

By simply giving yourself time limits and deadlines for your work, you force yourself to focus on the crucial elements of the task. You don’t make things more complex or challenging than they need to be just to fill the time.

Key Takeaways

  • If somebody starts talking about something that’s not on the agenda, you know that triviality is on your doorstep.

  • Set aggressive deadlines so that you are challenging yourself consistently, and you’ll avoid this pitfall.


  • Triviality can easily set in because it feels good to feel productive (even in minute ways) and voice your opinion. Know your real priorities and ask if progress is actually being made toward them.

  • Work expands to fill the time it is given, so give it less time. Wanting to work at a relaxed pace often just causes self-sabotage.

That’s it for today. We finished the book. I will start reading a new book from tomorrow. Please join.

What mental models we've learned so far?
  1. Address “Important”; Ignore “Urgent”

    Identify and address important tasks, ignore urgent tasks. Delegate important but non-urgent task and delete not important and not urgent tasks.

  2. Visualize All the Dominoes

    Don’t stop your analysis once the most obvious situations are articulated. Consider as many long-term possible ramifications as you can. Think twice about what you’re doing, and it helps to eliminate rash decisions.

  3. Make Reversible Decisions

    If you want to make the best decision possible, you can go ahead and use reversible decisions to learn exactly what you need to know.

  4. Seek “Satisfaction

    We need far fewer things than we originally thought and that our desires are masquerading as needs. Use Seek “Satisfaction” to achieve your priorities and ignore what doesn’t matter by creating a default choice.

  5. Stay Within 40-70%

    Utilize this mental model by intentionally consuming less information and even overgeneralizing — this means not looking at the subtleties of your options.

  6. Minimize Regret

    Minimize Regret. Jeff Bezos developed what he calls the regret minimization framework. In it, he asks one to visualize themselves at age 80 and ask if they would regret making (or not making) a decision. This simplifies decisions by making them about one metric: regret.

  7. Ignore “Black Swans”

    A black swan event is an entirely unpredictable event that comes out of nowhere. Doing so skews all data and beliefs, and people start to take the black swan into account as a new normal. But these are just outliers that should be ignored.

  8. Look for Equilibrium Points

    This mental model is about noticing trends in progress.

    When you first start something, you go from zero to one—that’s an infinite rate of progress. Then you go from one to two, two to three, and so on, and the rate of progress slows, and the returns start diminishing.

    Somewhere around there is an equilibrium point that truly represents what the average mean will be. Don’t make the mistake of not waiting for it.

  9. Wait for the Regression to the Mean

    This mental model is the final mental model about seeing the whole picture in terms of information.

    A change without reason for the change is not a change; it’s just a deviation. As such, it doesn’t represent what will continue to happen in the future.

    A regression to the mean is when things settle back down and resume what they were doing before—this is representative of reality.

  10. What Would Bayes Do (WWBD)?

    Bayes’ Theorem is something that does allow us to conclude the future: based on probabilities and taking into account events that have already occurred. All you need are the rough probabilities of three elements to plug into the Bayes’ formula, and you will come to a more accurate conclusion than so-called experts. This is basic probabilistic thinking.

  11. Do It Like Darwin

    Darwin was not a genius, but he did have one trait that set him apart from others: his undying devotion to truth.

    In doing so, he developed his golden rule (and our mental model) of giving equal weight and attention to arguments and opinions that opposed his own.

    Instead of growing defensive when presented with something that opposed him, he grew critical and sceptical toward himself. This radical open-mindedness puts aside confirmation bias and ego.

  12. Think With System 2

    System 1 focuses on speed and efficiency of thought, while System 2 focuses on accuracy and depth of thought. System 2 is smart, while System 1 is dumb.

    System 1 does more harm than good, but unfortunately, it is the one we default to because it is easier. Gain awareness of the difference between the two; acknowledge System 1, then jump immediately to System 2.

  13. Peer Review Your Perspectives

    Peer Review Your Perspectives. Many of the ways we fail at solving problems are related to our inability to look at other perspectives. We should be continually checking our perspectives through triangulation against those of others.

    Thinking and solving in a vacuum will never work because if you didn’t experience it firsthand, it wouldn’t make sense to you.

  14. Find Your Own Flaws

    This mental model is about resisting the comforting allure of confirmation bias and attempting to scrutinize yourself before others ever get the chance.

    Assume that you are wrong; this especially applies to interpersonal relationships. If you assume that you are at least 1% responsible for the conflict, your illusion of superiority and infallibility is broken, an important factor in social interaction.

  15. Separate Correlation From Causation

    Separate Correlation From Causation. They are entirely different things. Forcing a relationship where none exists will cause you to chase the wrong issue. In addition, you must separate proximate cause from root cause—the root cause is what we always want, and it can be reached through a series of questions.

  16. Storytell in Reverse

    When it comes to causation, sometimes we need to get better at thinking in a specific manner. You have a visual aid in a fishbone diagram, which document causes of causes and so on. This is storytelling in reverse because you start with a conclusion, and you work backwards through sometimes ambiguous means.

  17. SCAMPER It

    The SCAMPER method stands for seven techniques that help direct thinking toward novel ideas and solutions: (S) substitute, (C) combine, (A) adapt, (M) minimize/magnify, (P) put to another use, (E) eliminate, and (R) reverse.

  18. Get Back to First Principles

    When we try to solve problems, oftentimes we attempt to follow methods or a specific path just because they are the conventional means. But are they the best? First principles thinking strips away assumptions and leaves you with only a set of facts and a desired outcome. From there, you can forge your own solution.

  19. Avoid Direct Goals

    Direct goals are like shooting for the moon, while anti-goals, or inverse goals, are about avoiding crashing into the earth and doing everything to prevent that from happening. This has just as good a chance of achieving the outcome you want through direct goals, but it might get you there quicker and more efficiently. Articulate the factors involved in a worst-case scenario, then devote your time to preventing them.

  20. Avoid Thinking Like an Expert

    Experts think about the big picture and sometimes can’t be bothered with small details. Small details, counterintuitively, are mostly paid attention to by novices because they are absorbing new information and going slowly through a process. Thinking like an expert in a given field will probably mean that you make small mistakes because you engage in assumptive thinking and focus on overall effects and conception.

  21. Avoid Your Non-Genius Zones

    All of us have natural advantages in some things, and despite how hard we work, we will never be more than mediocre in other areas. Recognize your strengths, and while you shouldn’t stop trying to improve upon your weaknesses, understand where you will have the most impact.

  22. Avoid To-Do Lists

    Construct don’t-do lists. Narrowing down what you should be avoiding and what doesn’t matter will drastically free up your time. This means you will have less stress and anxiety and know exactly what your priorities are.

  23. Avoid the Path of Least Resistance

    Avoid the Path of Least Resistance. Does something appear too easy? It’s too good to be true. Avoid it. Seek resistance because that’s a sign that you are on the right path.

    Daily, we are faced with two choices: the easy thing and the right thing. We usually don’t even realise we have a choice, but you might discover that your instinct to avoid resistance is self-sabotage when you start categorising your choices honestly.

  24. Murphy’s Law

    Anything that can go wrong will go wrong, so make sure it doesn’t have the opportunity. Don’t rely on just getting by; make sure that you are as fail-safe as possible.

  25. Occam’s Razor

    The simplest explanation with the fewest variables is most likely to be the correct one. Our instinct is to go for the most mentally available explanation, which says more about what we want to see or avoid.

  26. Hanlon’s Razor

    Malicious acts are far more likely to be explained by incompetence, stupidity, or neglect; assumptions about one’s intentions are likely to be wrong. Improve your relationships by giving the benefit of the doubt and assuming, at worst, absent-mindedness.

  27. The Pareto Principle

    Pareto Principle: A natural distribution tends to occur, where 20% of the actions we take are responsible for 80% of the results; thus, we should focus on the 20% for maximum input-to-output ratio.

    This is in the name of becoming results-driven and simply following what the data is telling you. This is not about cutting corners; it is about understanding what causes an impact.

  28. Sturgeon’s Law

    90% of everything is crap, so be selective with your time and energy. Start with the 10% absolute non-crap and slowly work your way out. This is a more restrictive version of the Pareto Principle in some ways.

  29. Parkinson’s Laws

    First, triviality can easily set in because it feels good to feel productive (even in minute ways) and voice your opinion. Know your real priorities and ask if progress is actually being made toward them.

    Second, work expands to fill the time it is given, so give it less time. Wanting to work at a relaxed pace often just causes self-sabotage.

Mental Models: 30 Thinking Tools That Separate the Average from the Exceptional. Improved Decision-Making, Logical Analysis, and Problem-Solving

Author(s): Peter Hollins

Short Blurb: 30 Practical and applicable guidelines to think smarter, faster, and with expert insight (even if … Read more
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Part 29 of 29 in the 📖 Mental Models book series.

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