Communication is the process in which one or more messages travel from it's sender to therecipient of that message - through some kind of channel and with some noise. There are twobasic types of communication: verbal and nonverbal. This paper focuses on communicationstyles, whose main distribution in an aggressive, passive, passive-aggressive and assertivestyle. Assertive communication style represents I-messages, or messages that express theirown observations, feelings and perceptions of the situation with a clear meaningful messageand without intent to injure an active listener.Communication styles in the business can also be divided into these four categories. Theworking-age residents of the north of the Croatia according to a study conducted on a sampleof 100 people are used to assertive style in business communication.