Peter Bevelin has written a few amazing books, like Seeking Wisdom: From Darwin to Munger, A Few Lessons for Investors and Managers, and the latest All I Want To Know Is Where I’m Going To Die So I’ll Never Go There.

But one of his lesser-known books that I have on my all time favourites lists is A Few Lessons from Sherlock Holmes. Through this book, Bevelin has distilled Arthur Conan Doyle’s Sherlock Holmes into bite-sized principles and key quotes. In fact, this book is much more than a collection of quotes. It is a way to learn the powers of observation, understand the limits of our mind, and counter the narrative fallacy.

Bevelin writes in the book…

What distinguishes Holmes from most mortals is that he knows where to look and what questions to ask. He pays attention to the important things and he knows where to find them.

At the start of the book, Bevelin quotes mathematics and science writer Martin Gardner saying this about Sherlock Holmes –

Like the scientist trying to solve a mystery of nature, Holmes first gathered all the evidence he could that was relevant to his problem. At times, he performed experiments to obtain fresh data. He then surveyed the total evidence in the light of his vast knowledge of crime, and/or sciences relevant to crime, to arrive at the most probable hypothesis. Deductions were made from the hypothesis; then the theory was further tested against new evidence, revised if need be, until finally the truth emerged with a probability close to certainty.

There you have it! The entire process of solving a mystery is what the above paragraph contains –

In short, the three necessary qualities for good detective work are –

 

1. Observation – Gathering evidence
2. Deduction – Drawing inferences from evidence and working on them
3. Knowledge – Processing the evidence, testing the hypothesis, and arriving at the truth in light of what you know (and don’t know)

Drawing Parallels with Business Analysis
Is the work of an investor or an analyst working diligently through a company’s analysis any different than that of a detective in search of the ultimate truth in a crime? I believe not.

And thus, Bevelin’s work on Sherlock Holmes is a great guide for anyone wanting to learn how to analyze businesses to pick the right kind of stocks for long-term investment.

As I sat down to make notes from the book, here is what I ended up with (click on the image below or click here to see a bigger version)…

…a hand-made poster that now adorns my wall and which suggests a series of checklist points that can be of immense help while analyzing businesses.

 

Just consider these five big ideas from Sherlock Holmes contained in the above poster (and the relevant texts from Holmes’ books, in blockquotes, below), which is also what another brilliant detective (in the investment world) and thinker Charlie Munger suggests us to do –

1. Know Human Nature
(What motivates people and what interests them – a great tool while assessing managements and crowd behaviour)

Human nature is a strange mixture, Watson. You see that even a villain and murderer can inspire such affection that his brother turns to suicide when he learns that his neck is forfeited.

2. Learning Never Stops
(Be a learning machine, asks Charlie Munger)

Education never ends, Watson. It is a series of lessons with the greatest for the last.

3. Reason Backwards
(Invert, always invert, Munger advises)

The essential factor in this method consists in working back from observations of conditions to the causes which brought them about. It is often a question of deciding the doings of yesterday by the records found today.

4. Cultivate Multidisciplinary Thinking
(Build a latticework of mental models, suggests Munger)

Breadth of view…is one of the essentials of our profession. The interplay of ideas and the oblique uses of knowledge are often of extraordinary interest.

One’s ideas must be as broad as Nature if they are to interpret Nature.

5. Don’t Make the World Fit Your Tools
(Don’t be a man with the hammer, asks Munger)

The advances on the laboratory side and the perfection of instruments have added much to our powers of diagnosis, but they have given some men the idea that they are everything and the use of one’s eyes and hands is looked on as old-fashioned. The man whose first idea in an obscure thoracic case is to have an x-ray plate taken and who cannot “bother” with physical signs does not deserve the name diagnostician.

Road Map on How to Think
In his testimonial, Nassim Taleb says this about A Few Lessons from Sherlock Holmes…

We Sherlock Holmes fans, readers, and secret imitators need a map. Here it is. Peter Bevelin is one of the wisest people on the planet. He went through the books and pulled out sections from Conan Doyle’s stories that are relevant to us moderns, a guide to both wisdom and Sherlock Holmes. It makes you both wiser and eager to reread Sherlock Holmes.

It’s brilliant, this slim 73-page book that culls the essence of the world’s greatest detective’s teachings. Peter Bevelin demonstrates what students of Holmes have always known – that the adventures of the fictional detective are not just entertaining tales, but a road map on how to think, do research and hit upon a solution to a problem, whether it pertains to crime, or life, or investing.

“You know my methods. Apply them!” Holmes said in The Hound of the Baskervilles, which was published in 1902. More than a century later, that advice remains of great importance if you want to become a better thinker and investor.

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