JP Castlin
@jpcastlin.bsky.social
Ex-lawyer strategy advisor + author. Discoverer of dynamic uncertainty, inventor of the 4E model of market dynamics, creator of frameworks, and PA of (a.k.a. father to) Idun and Edda. As seen on stage, on TV, in books, in newspapers, in columns, etc.
Is it a bird? Is it a plane? Well, what are you most biased to see?
In today’s free-for-all newsletter, I take a critical view on the branch of behavioral science that is often reduced to social media memes.
In today’s free-for-all newsletter, I take a critical view on the branch of behavioral science that is often reduced to social media memes.
The one on behavioral science
Well, part of it anyway.
strategyinpraxis.substack.com
November 28, 2025 at 9:45 AM
Is it a bird? Is it a plane? Well, what are you most biased to see?
In today’s free-for-all newsletter, I take a critical view on the branch of behavioral science that is often reduced to social media memes.
In today’s free-for-all newsletter, I take a critical view on the branch of behavioral science that is often reduced to social media memes.
Is it a condor? Is it a UFO? Well, it must be the latter, because we can’t really see what it is.
So here is today’s newsletter, featuring an analysis of Nvidia’s quarterly report and a first look at my new WeftPoints method, but not featuring a TL;DR.
So here is today’s newsletter, featuring an analysis of Nvidia’s quarterly report and a first look at my new WeftPoints method, but not featuring a TL;DR.
The (last) one on decision-making
A work in progress
strategyinpraxis.substack.com
November 21, 2025 at 9:01 AM
Is it a condor? Is it a UFO? Well, it must be the latter, because we can’t really see what it is.
So here is today’s newsletter, featuring an analysis of Nvidia’s quarterly report and a first look at my new WeftPoints method, but not featuring a TL;DR.
So here is today’s newsletter, featuring an analysis of Nvidia’s quarterly report and a first look at my new WeftPoints method, but not featuring a TL;DR.
Before you have kids, the concept of catching vomit with your hands does not really exist in your realm of imagination.
November 17, 2025 at 3:33 PM
Before you have kids, the concept of catching vomit with your hands does not really exist in your realm of imagination.
Is it a penguin with a jet pack? Is it a flying saucer? No, it is a newsletter on the essence of strategy!
The TL;DR:
The TL;DR:
The one about the essence of strategy
A one-week off piste
strategyinpraxis.substack.com
November 14, 2025 at 8:04 AM
Is it a penguin with a jet pack? Is it a flying saucer? No, it is a newsletter on the essence of strategy!
The TL;DR:
The TL;DR:
Reposted by JP Castlin
Scott Galloway is a raging misogynist and it’s good to see this piece actually grapple with the toxic worldview he pushes
What Did Men Do to Deserve This?
Changes in the economy and in the culture seem to have hit them hard. Scott Galloway believes they need an “aspirational vision of masculinity.”
www.newyorker.com
November 10, 2025 at 4:36 PM
Scott Galloway is a raging misogynist and it’s good to see this piece actually grapple with the toxic worldview he pushes
Oh, and I'm back writing columns for MarketingWeek. How about that?
www.marketingweek.com/brand-buildi...
www.marketingweek.com/brand-buildi...
Don’t confuse brand building for a measure of ROI
Marketers who see brand building as an end in itself are mistaking the work they do for the results it delivers.
www.marketingweek.com
November 7, 2025 at 9:32 AM
Oh, and I'm back writing columns for MarketingWeek. How about that?
www.marketingweek.com/brand-buildi...
www.marketingweek.com/brand-buildi...
Is it a bat? Is it a UFO? No, it is another newsletter on decision-making — this time on how to improve both quality and speed of movement by shifting from stage gates to guardrails.
The (fourth) on decision-making
Just one more
strategyinpraxis.substack.com
November 7, 2025 at 8:41 AM
Is it a bat? Is it a UFO? No, it is another newsletter on decision-making — this time on how to improve both quality and speed of movement by shifting from stage gates to guardrails.
One of these days, some poor marketer is going to discover Hotelling's law and end up hospitalized.
October 31, 2025 at 2:35 PM
One of these days, some poor marketer is going to discover Hotelling's law and end up hospitalized.
Is it a kite? Is it Superman? No, wait. It is a free-for-all newsletter on theory vs practice.
TL;DR:
TL;DR:
The one on theory vs practice
A free-for-all
strategyinpraxis.substack.com
October 31, 2025 at 9:02 AM
Is it a kite? Is it Superman? No, wait. It is a free-for-all newsletter on theory vs practice.
TL;DR:
TL;DR:
Is it a seagull? Is it a space ship? No, it is an analysis of the state of AI investments. Oh, and the actual newsletter: this week on Gary Klein’s RPD model for decision-making under uncertainty.
TL;DR:
TL;DR:
The (third) on decision-making
Introducing RPD
strategyinpraxis.substack.com
October 24, 2025 at 7:56 AM
Is it a seagull? Is it a space ship? No, it is an analysis of the state of AI investments. Oh, and the actual newsletter: this week on Gary Klein’s RPD model for decision-making under uncertainty.
TL;DR:
TL;DR:
Is it a bird? Is it a plane? No, it is the supply for popular demand: a free-for-all one off newsletter on writing and AI.
Is it doomed to constitute, as so many writers appear to believe, intellectual entropy?
strategyinpraxis.substack.com/p/the-only-o...
Is it doomed to constitute, as so many writers appear to believe, intellectual entropy?
strategyinpraxis.substack.com/p/the-only-o...
The (only) one writing and AI
A pause in the natural order of things
strategyinpraxis.substack.com
October 17, 2025 at 8:55 AM
Is it a bird? Is it a plane? No, it is the supply for popular demand: a free-for-all one off newsletter on writing and AI.
Is it doomed to constitute, as so many writers appear to believe, intellectual entropy?
strategyinpraxis.substack.com/p/the-only-o...
Is it doomed to constitute, as so many writers appear to believe, intellectual entropy?
strategyinpraxis.substack.com/p/the-only-o...
Is it a dragonfly? Is it a kite? We are still not quite sure. Oh, wait! It is another newsletter on uncertainty — this one on my own work.
The TL;DR:
The TL;DR:
The (second) one on decision-making
Enter dynamic uncertainty
strategyinpraxis.substack.com
October 10, 2025 at 7:49 AM
Is it a dragonfly? Is it a kite? We are still not quite sure. Oh, wait! It is another newsletter on uncertainty — this one on my own work.
The TL;DR:
The TL;DR:
Is it a bird? Is it a plane? We aren’t really sure. Oh, wait! It’s a free-for-all newsletter about decision-making under uncertainty! And the 2026 keynotes too!
TL;DR:
TL;DR:
The (first) one on decision-making
A free-for-all
strategyinpraxis.substack.com
October 3, 2025 at 7:49 AM
Is it a bird? Is it a plane? We aren’t really sure. Oh, wait! It’s a free-for-all newsletter about decision-making under uncertainty! And the 2026 keynotes too!
TL;DR:
TL;DR:
Is it a pterodactyl? Is it an airship? No, it’s the latest newsletter: the second on emergent strategy.
The (second) on emergent strategy
The Strategy Omnibus contined
strategyinpraxis.substack.com
September 19, 2025 at 7:42 AM
Is it a pterodactyl? Is it an airship? No, it’s the latest newsletter: the second on emergent strategy.
Is it a bird? Is it a plane? No, it is a free-for-all newsletter introducing emergent strategy.
The TL;DR:
The TL;DR:
The (first) one on emergent strategy
A free-for-all
strategyinpraxis.substack.com
September 12, 2025 at 7:46 AM
Is it a bird? Is it a plane? No, it is a free-for-all newsletter introducing emergent strategy.
The TL;DR:
The TL;DR:
Is it a bird, is it a plane? No, it is the last newsletter in our series on visioning and missioning.
TL;DR:
TL;DR:
The (final) one on visions
The pragmatic view
strategyinpraxis.substack.com
September 5, 2025 at 7:06 AM
Is it a bird, is it a plane? No, it is the last newsletter in our series on visioning and missioning.
TL;DR:
TL;DR:
Is it a bird, is it a plane?
No, it’s a free-for-all newsletter about visions and missions.
Enjoy.
strategyinpraxis.substack.com/p/the-first-...
No, it’s a free-for-all newsletter about visions and missions.
Enjoy.
strategyinpraxis.substack.com/p/the-first-...
The (first) one on visions
The Strategy Omnibus continued
strategyinpraxis.substack.com
August 22, 2025 at 8:23 AM
Is it a bird, is it a plane?
No, it’s a free-for-all newsletter about visions and missions.
Enjoy.
strategyinpraxis.substack.com/p/the-first-...
No, it’s a free-for-all newsletter about visions and missions.
Enjoy.
strategyinpraxis.substack.com/p/the-first-...
Is it a bird? Is it a plane? No, it is another newsletter on positioning. The last one, I promise.
The TL;DR:
The TL;DR:
The last one on positioning
I promise.
strategyinpraxis.substack.com
August 15, 2025 at 7:39 AM
Is it a bird? Is it a plane? No, it is another newsletter on positioning. The last one, I promise.
The TL;DR:
The TL;DR:
Reposted by JP Castlin
Economic canon discusses three types of uncertainty. On my Blog, @jpcastlin.bsky.social and I write about Dynamic Uncertainty — a natural uncertainty from emergence inherent to business. @fionatribe.bsky.social @caff.bsky.social @theropodpublishing.bsky.social
www.douggarnett.com/complexity-i...
www.douggarnett.com/complexity-i...
Complexity: The Dynamic Uncertainty of Emergence | Doug Garnett’s Blog
In the May 23rd edition of JP Castlin’s Strategy in Praxis newsletter we suggested businesses often face a type of uncertainty JP named "dynamic uncertainty"
www.douggarnett.com
August 1, 2025 at 11:07 PM
Economic canon discusses three types of uncertainty. On my Blog, @jpcastlin.bsky.social and I write about Dynamic Uncertainty — a natural uncertainty from emergence inherent to business. @fionatribe.bsky.social @caff.bsky.social @theropodpublishing.bsky.social
www.douggarnett.com/complexity-i...
www.douggarnett.com/complexity-i...
In the second free-for-all in a row before we go back to premium exclusives for a month, we take a look at the basics of adaptive strategy. In summary:
The one on adaptive strategy 101
Another free-for-all
strategyinpraxis.substack.com
August 1, 2025 at 7:43 AM
In the second free-for-all in a row before we go back to premium exclusives for a month, we take a look at the basics of adaptive strategy. In summary:
£29-35k annual salary to be a "senior research executive" in a "global healthcare team" for a "highly respected research agency".
How are they respected when they pay that little?
How are they respected when they pay that little?
July 21, 2025 at 9:06 AM
£29-35k annual salary to be a "senior research executive" in a "global healthcare team" for a "highly respected research agency".
How are they respected when they pay that little?
How are they respected when they pay that little?
So what is the evolutionary purpose of mosquito bites itching like a bastard other than to remind everyone that mosquitoes are assholes?
July 20, 2025 at 7:25 AM
So what is the evolutionary purpose of mosquito bites itching like a bastard other than to remind everyone that mosquitoes are assholes?
Today on Strategy in Praxis, would you believe it, a TL;DR instead of a placeholder. Also, a continuation of our look into positioning.
In summary:
In summary:
The (second) one on positioning
The Strategy Omnibus continued
strategyinpraxis.substack.com
July 18, 2025 at 8:06 AM
Today on Strategy in Praxis, would you believe it, a TL;DR instead of a placeholder. Also, a continuation of our look into positioning.
In summary:
In summary:
On LinkedIn just now: ”You are the greatest project you will ever work on.”
Sometimes there just isn’t enough vomit in the world..
Sometimes there just isn’t enough vomit in the world..
July 16, 2025 at 2:55 PM
On LinkedIn just now: ”You are the greatest project you will ever work on.”
Sometimes there just isn’t enough vomit in the world..
Sometimes there just isn’t enough vomit in the world..
So I wrote another thing, this one echoing some of that which @carlbergstrom.com has long argued, and put it on LinkedIn of all places.
On LLMs, Dunning-Kruger effects, and the omniscient observer paradox.
www.linkedin.com/pulse/dunnin...
On LLMs, Dunning-Kruger effects, and the omniscient observer paradox.
www.linkedin.com/pulse/dunnin...
The Dunning-Kruger Machine
On January 6, 1995, McArthur Wheeler and Clifton Earl Johnson robbed two banks in the greater Pittsburg area - the Swissvale branch of Mellon Bank and the Fidelity Savings Bank in Brighton Heights, re...
www.linkedin.com
July 14, 2025 at 9:35 AM
So I wrote another thing, this one echoing some of that which @carlbergstrom.com has long argued, and put it on LinkedIn of all places.
On LLMs, Dunning-Kruger effects, and the omniscient observer paradox.
www.linkedin.com/pulse/dunnin...
On LLMs, Dunning-Kruger effects, and the omniscient observer paradox.
www.linkedin.com/pulse/dunnin...