Knowledge Tree
and Butterfly
More thinking, less grinding

Tasks aren't roles

"Computer" used to be a job title. Seventy-five seconds on what happened to the people who held it, and what that says about the jobs agentic AI is changing now. It starts muted; the words are under the film if you'd rather read.

The words

Once, "computer" was a job title… then it got washed away.

Every task is one of four kinds: Specify, Implement, Review, Feedback.

Each computer held a hand of tasks, and the job was mostly one task type: calculate, calculate, tabulate, copy out results. Then the task went to a machine, and the job title went with it. The people stayed, and the hand changed: specify the run, catch the silent error. Many human computers became the first programmers.

Cheaper computing didn't mean less computing work. It meant far more of both: about 5,000 computers worldwide in 1959, billions now; about 160,000 programmers in the US in 1970, about 2.5 million now. And the programmers branched into new jobs: software developers, data scientists, testers, database specialists, web developers, and a few still called computer programmers.

A job title names a hand of tasks. Some hands are mostly one card, even the programmer's. Those cards go to the machine, and the hand is redealt. New names come later. They did last time.

The machine takes the I. People keep S, R and F. The jobs get more productive… and more interesting.

Figures: ETHW (computers, 1959); Gilchrist and Weber, Communications of the ACM, 1974 (US census, 1970); US Bureau of Labor Statistics, Occupational Outlook Handbook, 2025. The 2.5 million counts programmers and the six occupations that grew out of programming. The shares of a week drawn on the loop are illustrative.

Which cards are you short of?

The two skills the last change rewarded were saying precisely what you want, and knowing enough about the machine to catch it when it is silently wrong. Specify and Review. Two Doors teaches both: the tooling for people who work with data and evidence, and the analysis for people who build software.

See Two DoorsAsk for a free 20-minute call

Prefer to write? hello@ktandb.co.uk.