The four-sides model (also known as communication square or four-ears model) is a communication model by Friedemann Schulz von Thun. According to this model every message has four facets though not the same emphasis might be put on each. The four sides of the message are fact, self-revealing, relationship, and appeal.
The communication square describes the multi-layered structure of human utterance. It combines the postulate (second axiom) of Paul Watzlawick, that every communication has a content and a relationship aspect, with the three sides of the Organon model by Karl Bühler, that every information contains something about the matter, the sender and the receiver. Such models are familiar in the linguistic as models of the speech act.
Every layer can be misunderstood individually. The classic example of Schulz von Thun is the front-seat passenger which tells the driver: "Hey, the traffic lights are green". The driver will understand something different regarding to the ear with which he will hear and will react differently. (on the matter layer he will understand the "fact" "the traffic lights are green", he could also understand it as "Come on, drive! ."-"command", or on the "relationship" could hear a help like "I want to help you or if you hear behind it: I am in a hurry it reveals part of yourself "self-revelatory".") The emphasis on the four layers can be meant differently and also be understood differently. So the sender can stress the appeal of the statement and the receiver can mainly receive the relationship part of the message. This is one of the main reasons for misunderstandings.
What I inform about:
On the matter layer the sender of the news gives data, facts and statements. It is the task of the sender to send this information clearly and understandably.
The receiver proves with the Matter ear, whether the matter message fulfills the criteria of truth (true/untrue) or relevance (relevant/irrelevant) and the completeness (satisfying/something has to be added).
In a long-term team, the matter layer is clear and needs only a few words.
What I reveal about myself:
In every news there is information about the sender. On the layer of the self-revealing or self-disclosure the sender reveals himself. This message consists of conscious intended self-expression as well as unintended self-revealing, which is not conscious to the sender (see also Johari window). Thus, every news becomes information about the personality of the sender.