Even if you are happy with your written and edited text, every document needs checking for silly mistakes (everyone needs to get a final check from a ‘second pair of eyes'). When you’ve been involved in writing a document your brain tends to ‘autocorrect’ and you see what you think you’ve written.
That’s why we always review each other’s work. Proofreading is the last chance to check printed documents, whereas websites can be corrected at any time. Nevertheless 'typos' tend to hang around for months if you don't have your web content proofread.
