It started with a problem.
Robert Merton, a sociologist at Columbia University, and Paul Lazarsfeld developed the focused interview technique in the early 1940s as part of wartime government communications research. They brought groups of people together to discuss specific radio broadcasts and propaganda materials, using the group interaction to reveal responses that individual interviews did not capture. The technique was applied to commercial market research after the war. By the 1950s, advertising agencies and consumer goods companies were using focus groups regularly to test product concepts, advertising, and packaging. The term 'focus group' came into common use in this period.
Historical sources below ↓Then something changed.
The focus group gave product developers access to customer language and emotional responses that surveys could not capture. A group of eight people discussing a product concept in sixty minutes could reveal what specific words, images, or ideas resonated or failed — information that quantitative data provided after launch could not offer at a comparable stage. The technique became standard in consumer goods, media, and political campaigning. It was also frequently criticized: a small non-representative group discussing an unfamiliar concept in an artificial setting provided a limited and sometimes misleading signal about how a real market would behave. Both the utility and the limitations are real.
What a builder can learn.
Our interpretation: the focus group is a tool for generating hypotheses, not confirming them. When a focus group reveals that every participant disliked a specific element of a design, that is a hypothesis worth testing with a larger group. When a focus group generally approves a concept, that does not predict sales. For a business builder, the value is in listening to customer language and discovering which problems they articulate versus which they do not — not in using the group's reactions as a vote on what to build.
A door still open.
A hypothesis worth testing: if a small business ran an informal version of a focus group — invited five existing customers to a thirty-minute conversation about a product or service challenge — and recorded specific words and phrases customers used to describe the problem, would those words appear in the business's current marketing? If not, what would change if they did?
What language do your customers use to describe the problem you solve that you are not using in the way you describe your own business?
Follow the evidence.
History is sourced below. Business lessons are editorial interpretations; future possibilities are questions to test, not predictions.
Prepared from primary-source histories. First edition: 25 Sept 2026.