The following points are necessary for writing an effective memo:

•    Write for your audience: Consider education, background, company status, and recipient needs.
•    Informative subject line: Be upfront and non-generic as to what the memo is about.
•    Write the bottom-line first: Optimally, the first sentence or two should contain what you want the readers to know or act upon. Exceptions include critical or 'bad-news' memos.
•    Concise: Check for needless words; keep the memo to one page or less, and use attachments or separate summaries for additional information.
•    Coherent: Keep the memo structure simple and logical, limit one idea per paragraph.
•    Common language: Keep your message to accessible language, no showing off.
•    Factual Tone: Use a neutral or positive tone where applicable, avoid emotionally-charged words.
•    Conclusion: If needed, add a conclusion, or closing, to your memo to reaffirm or summarize the memo's points.
•    Formatting: Follow company-specific guidelines, use short paragraphs, bullet points, and strategic placement of details. Utilize memo