Concept
The Friendship Formula
The friendship formula is Jack Schafer's summary of how rapport grows between people: friendship is a function of proximity, frequency, duration and intensity, so being near someone, often, for long enough and in ways that matter to them builds liking over time.
Schafer, a former FBI behavioural analyst who trained agents to build relationships with sources, wrote The Like Switch with Marvin Karlins. The formula makes rapport sound mechanical, and in part it is. Proximity means sharing space without pressure; research on the mere-exposure effect suggests we tend to warm to what is familiar. Frequency means repeated contact. Duration means time spent together, and intensity means how well an interaction meets the other person's needs, through attention, curiosity and relevance. Schafer pairs the formula with nonverbal friend signals that tell the other person you are not a threat: the brief eyebrow flash when you recognise someone, a slight head tilt, a genuine smile that reaches the eyes. Together they explain why trust rarely comes from one brilliant meeting and usually from many ordinary ones. The method carries an obvious risk, since a spy can use it too. Used honestly, it is simply a description of how to be a reliable, pleasant presence in someone's life.
A real-life example
Hande joins a logistics company in Gebze and needs the warehouse chief, Yusuf, on her side. Instead of one long meeting, she stops by his office for five minutes twice a week, remembers that his daughter is sitting exams, and greets him with a quick smile and raised eyebrows when they pass. A month later, when she needs a shift changed at short notice, he arranges it in an hour.
How to use it
- 1Choose one working relationship you want to strengthen.
- 2Plan short, regular contact rather than one long meeting, and keep each one useful or friendly.
- 3Use the friend signals naturally: a quick eyebrow raise on greeting, a real smile, your full attention.