This document discusses communication in open source communities. It defines communication as including spoken words, written words, body language, and implied meanings. It describes different types of online and in-person communication channels that community members can use. The document cautions that sarcasm, jokes and criticism without balance often do not work well and can be hurtful. It provides tips for providing constructive criticism by using a "compliment sandwich" approach. Finally, it emphasizes the importance of embracing diversity in open source communities.