Way back in 1918 William Strunk, Jr. published 'The Elements of Style'. It's a very small book, and it's now a very old book, but it's still in print and anyone who writes business letters can't do better than to follow the advice given right at the beginning of it:
"Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subject only in outline, but that every word tell."
- Establish what you want to achieve with your letter before you begin to write it.
- Don't stray from the point. Ensure that you are aware of all the relevant facts before you begin the letter and use only those facts.
- Set out facts and arguments in logical sequence. Use facts as paragraph topics.
- Be clear and concise and omit unnecessary words. Replace several words with one word wherever possible. Short sentences are easier to assimilate and have greater impact than long ones: aim at an average length of 15 or 20 words. Sentences can be shortened by adding full stops and/or removing purposeless words that add nothing to the sense of the sentence - but remember that this pruning process may require that you reorganise what is left.
- Say what you have to say in plain everyday English. Don't use unusual words.
- Be 'friendly'. Letters that use 'I', 'you' and 'we' are more appealing (and therefore more effective) than those that use a colder, more formal business style - and as a reader pays far more attention to a letter if he or she is referred to constantly, use the word 'you' as much as possible.
Presentation matters.
- When you have finished composing your letters, proof read them - and don't rely on your spell check to do that for you. Spell check makes contextual mistakes - sometimes ridiculous mistakes that could make you look ridiculous. Read your letters over and check spelling and punctuation yourself before sending them.
- Check your letters for clarity. Does your letter say what you want it to say? Is it clear what you expect as a result of it?
- Check that everyone necessary has been copied in.
- Check that enclosures or attachments, if any, are present and legible.
- Sign ALL letters. (Yes! There really are people who don't bother to do that.) Try to develop a firm legible signature, and if you can't do that - and actually I can't myself - make sure your name appears typed beneath your signature. You won't always be writing to 'friends' - and no one is going to be in a hurry to call you or write to you to try and resolve anything if they can't figure out what your name is.
E-mails have made us all sloppy about presentation, spelling, and punctuation, but however sloppy you are prepared to be in your e-mails, you can't afford to be sloppy about your letters. Your letters are YOU - and they are the public face of your Company. They must be professional and look attractive to the eye. Ask yourself how you would react to a sloppy, ill-spelled, badly presented letter. How seriously would you take it? What impression would you form of the writer?
Presentation matters!