There are two kinds of memo type / kind of memo, the memo official and unofficial. Official Memo is usually made by a government agency or organization. While the memo was not authorized to be made by anyone. Writing a short message should pay attention to the effectiveness of sentences and speak politely. In this case the sentence should note that the use of effective, communicative, and linguistic politeness goals in a brief message in order to understand the core message recipient without incurring any questions or misunderstandings.
Messages can be delivered either directly or indirectly. For indirect message, the message is conveyed in writing. In writing a written message, note the following:
1. Write clearly to whom the message is intended.

2. Write down who is making the message

3. Write messages with polite language,

4. Write the message with an effective sentence / short and easy to understand.