7.4.2 Communication Policies Many teams establish a communication agreement that clarifies which methods will be used in which situations. For example, a common agreement is that chat rooms will be the primary communication channel but only for ephemeral discussions. If a decision is made in the chat room or an announcement needs to be made, it will be broadcast via email. Email is for information that needs to carry across oncall shifts or day boundaries. Announcements with lasting effects, such as major policies or design decisions, need to be recorded in the team wiki or other document
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