Written communication provide a permanent record of a message and can be looked at more than once to check understanding. The main forms of written communications are letter, memorandum, agenda, minutes of meeting, job descriptions, purchase order, invoice and company magazine. Advantages are that a lot of details can be sent, messages may be copied for many people to read, it is a cheap and quick method. Disadvantages are that direct feedback is not always possible, language might be hard to understand, cannot always check if message has been received or read.