Most first-time founders fall in love with their product and quietly assume the customer will too. Jobs to Be Done (JTBD) flips that instinct. It says people do not buy products, they hire them to make progress in a specific situation. Your job is to uncover the real progress your customer is reaching for, and the JTBD interview is the tool that gets you there. This lesson shows you how to run one.
What a "job" actually is
A job is the progress a person is trying to make in a particular circumstance. It has functional, emotional, and social dimensions. Clayton Christensen popularised this idea in his 2016 book Competing Against Luck: customers do not buy products, they hire them to get a job done. When a product does the job well, they hire it again. When it fails, they fire it and look for a replacement. In the famous McDonald's milkshake study that Christensen and Bob Moesta worked on, the team found that roughly 40 percent of milkshakes were bought first thing in the morning, by solo commuters who ordered them to go and drank them in the car. These commuters were hiring the thick shake to make a boring drive less dull and to hold off hunger until lunch. That had nothing to do with the flavour survey McDonald's had been running.
Why interviews beat surveys
Surveys tell you what people say they want, usually small tweaks to what already exists. Interviews uncover why they actually switched. For an Indian founder, this is the difference between asking a kirana owner whether he would like a cheaper billing app, and discovering that he abandoned his paper bahi khata because he kept losing track of udhaar given to regulars and was quietly losing money every month. The second insight tells you what to build. The first does not.
The switch interview: reconstruct the timeline
The most useful JTBD interview is the switch interview, developed by Bob Moesta and Chris Spiek. Find someone who recently started, or stopped, using something like yours, then walk backwards through their decision like a detective. When did the idea first enter your head? What was happening in your life that week? What did you try first? Who else was involved in the decision? What almost stopped you from buying? Rebuild the timeline from the first thought, to the purchase, to the first use. You are hunting for the real trigger, not the tidy reason people offer afterwards.
The four forces of progress
Moesta maps every switch onto four forces:
- Push: the frustration with the current situation.
- Pull: the attraction of the new solution and the better life it promises.
- Anxiety: the fear of the new, such as whether it will work, whether they will look foolish, or what happens to their data.
- Habit: the comfort of what they already do.
A customer switches only when push plus pull is stronger than anxiety plus habit. Most founders obsess over pull, meaning features, and ignore anxiety and habit, which is why good products still fail to convert. If your kirana owner trusts his paper book because he has used it for twenty years, no feature list beats that habit until you reduce his anxiety about going digital.
How to run your first interview
- Pick five recent customers or switchers, not prospects who only imagine using you.
- Ask about the last specific time, not what they "usually" do. Concrete stories carry truth, generalisations hide it.
- Ask "why" and "then what happened" repeatedly, then stay silent and let them talk.
- Never pitch. The moment you defend your product, the interview is over.
- Afterwards, sketch the timeline and label the four forces you heard.
Do this five times and the same underlying job will surface in different words. That job, not your feature roadmap, is what you are really selling. Build and message around it, and product-market fit stops being a matter of luck.