Informative documents include financial statements, newsletters, research reports, summaries, thank-you notes and account adjustments. Transmittals are another form of informative message that explains what’s being sent. Faxes and emails with attachments often come with letters of transmission. To provide the intended message, informative documents should be relevant and brief, or simple if brief is not possible. Positive informative documents don’t need the same level of goodwill building as persuasive or negative documents, but informative messages should still show consideration for the intended audience.