What is the informal pattern of communication in an organization commonly called?

The informal pattern of communication in an organization is commonly referred to as the grapevine. This term describes the unstructured, unofficial channels through which information flows among employees. The grapevine operates independently of formal communication systems and is often based on social interactions, personal relationships, and mutual interests among employees.

The grapevine can be an important source of information within an organization, as it allows for quick dissemination of news and updates, whether related to work or personal matters. It also plays a significant role in shaping workplace culture and influencing employee morale.

The other terms mentioned refer to different forms of communication that do not capture this informal and often spontaneous nature. For example, "chit chats" might suggest casual conversations, but they do not encompass the broader network and implications of the grapevine. "Bulletin" refers to official announcements or communications, typically disseminated in a structured manner. "Free news" is not a commonly recognized term in this context and does not encapsulate the informal dynamics of workplace communication. Thus, the grapevine is the most fitting description of informal communication patterns in organizations.