Every assistant spends a considerable amount of her or his time communicating. Much of this communication is written. Writing is an example of one-way information transfer. Whether it is a letter, e- mail, memo, fax, proposal or report, it is important that it achieves its purpose. To do that it needs to be clear, persuasive, well presented and devoid of grammatical, spelling or punctuation errors. Your boss relies on you to be able to do this.