Where did the formula come from?
The term was coined by American psychologist Thomas Gordon in his 1970 book “Parent Effectiveness Training.” He explained the choice of the name simply: the message begins with “I” because the speaker has an unmet need.
Interestingly, the parallel line in the method’s history is older : in the assertiveness tradition, such statements are traced back to Andrew Salter’s 1949 work and his concept of the “language of feelings.” This means that the idea of speaking for oneself is not confined to a single school and has arisen in psychology several times.
Another detail that’s almost always lost in retellings. Gordon wrote that the “I” message usually creates a problem for the other person , so he added a separate step: immediately after such a phrase, switch to listening. He didn’t conceive of the formula as a standalone technique.
This is important because the popular version of the method reads like a spell: say it correctly, and you’ll be heard. The author himself didn’t think so.
What does an I-message actually look like?
Gordon’s approach consists of three parts: a non-judgmental description of the behavior, the speaker’s feelings, and a concrete, tangible consequence . His own example goes something like this: “When you spill sand from the sandbox on my carpet, it takes me a long time to clean up, and I don’t like it.”
The four-part formula popular today, ending with a request, is a hybrid of two different schools . The fourth step comes from Marshall Rosenberg’s nonviolent communication, which has exactly four steps: observation, feeling, need, and request.
Both options work, but it’s useful to understand the difference. Gordon described a situation in which the speaker has the problem. Rosenberg constructed a full negotiation cycle, culminating in a request.
What the research showed
The first classic experiment was conducted in the early 1990s: participants rated different versions of the same complaint. Accusatory statements beginning with “you” were perceived as more unpleasant and evoked more negative emotions and a desire to respond aggressively than assertive “I” statements.
The most powerful study was published in 2018: 253 participants rated six conflict scenarios—with a partner, friends, and colleagues—using eight variations of the first sentence. Speaking “I” significantly reduced the expected defensiveness , and the effect was significant by psychological standards.
The scenarios chosen were everyday and recognizable: unfairly divided household chores, lateness, an unfulfilled promise. This gives an idea of the specific conversations the method was tested on.
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