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Predictability: Markets, customer needs, and technology were seen as relatively stable, so careful upfront analysis could reliably forecast demand.[1][2]Expertise first: Internal experts, engineers, and managers were expected to define what “good” looked like before customers ever saw it.[3][4]Efficiency through scale: The goal was to design once, then maximise efficiency via mass production and distribution, spreading huge fixed costs over volume.[2][5]
Heavy research and planning: Market studies, long strategy cycles, detailed business plans, often years ahead.[6][1]Design and build in full: Complete products or services designed to be “right” on launch, with long development cycles.[7][8]Launch and push: Big launches, advertising, and sales efforts to create demand for what had already been built.[5][2]
Getting it wrong is expensive, so invest heavily to get it right before launch.[1][3]Quality equals perfection at release, not learning after release.[9][3]Customers react; they don’t co‑create. The firm’s job is to design and persuade, not to discover alongside the customer.[6][1]
Repeated decisions: Leaders keep acting from the same mental model (plan–make–sell), so similar choices are made again and again: long planning cycles, perfection before launch, big-bang releases.Embedded in routines: Those choices become standard processes, templates, stage‑gates, sign‑offs, and KPIs. People learn that success means following the model.Taught socially: New hires are coached, rewarded, and promoted for thinking and behaving in line with that model. Questioning it feels risky or disloyal.Invisible norm: Over time, no one says “our mental model is plan–make–sell”; they just believe serious, professional work looks like long analysis, big specs, and polished launches, not small experiments.
“The real cost of this mental model isn’t just wasted projects; it’s years spent perfecting the wrong things.”“This culture doesn’t just burn money; it buries learning under layers of certainty.”“The hidden bill for plan–make–sell is paid in complexity: every ‘perfect’ launch hard‑codes more assumptions you can’t easily unwind later.”“When the mental model is ‘get it right before they see it,’ the price you pay is simple: slow learning, expensive mistakes, and a business that gets more complex every time you try to improve it.”
Research mental models last century
The prevailing mental model was “plan–make–sell.” It assumed the business could think its way to the right answer up front, then push that answer into the market.
Core assumptions of the old model
Typical sequence
Embedded beliefs
This “plan–make–sell” mental model is the backdrop you are contrasting with today’s “test–learn–pivot” culture.
Last century’s default was a plan–make–sell mental model. Businesses would (sometimes) research, then design, then fully build, and only then try to sell. This approach poured time and money into perfecting products and services before customers ever touched them, often discovering too late that what had been built was not quite what the market wanted. It rested on a set of strong assumptions: that markets and customer needs were predictable, that internal experts could define “the right answer” upfront, and that efficiency came from locking in a design and scaling it hard. Underneath it all sat a belief that getting it wrong after launch was too expensive to risk, so learning had to happen before anything reached the customer—this is the mental model your chapter is contrasting.
A mental model becomes culture when it stops being a “decision” and starts being “just how we do things around here.”
How mental model → culture
In your context: last century’s mental model of “get it right before the customer sees it” hardens into a culture that fears visible learning and treats complexity as the price of being “thorough.”
Punch line on the cost
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