In interpersonal communication, an I-message or I-statement is an assertion about the feelings, beliefs, values, etc. of the person speaking, generally expressed as a sentence beginning with the word "I", and is contrasted with a "you-message" or "you-statement", which often begins with the word "you" and focuses on the person spoken to. Thomas Gordon coined the term "I message" in the 1960s while doing play therapy with children. He added the concept to his book for parents, P.E.T.: Parent Effectiveness Training (1970). Not every message that begins with the word "I" is an I-message.