There are six main categories of routine announcements: informative messages, granting requests for information and action, granting claims and requests for adjustments, providing recommendations and references, and announcing good news. Informative messages include remainder notices, organizational changes, upcoming events, changing policies, customer shipping policies, and company developments. They should state the purpose briefly, provide necessary details, and end with a courtesy note. Most informative communications are neutral, such as departmental meeting announcements and remainder notices, but some, like policy statements and procedural changes, require additional care.