When editing a long piece of work such as a thesis, research report, or exegesis, it’s important to have a system. The first thing to note is that there is a difference between editing and proofreading. Whereas proofreading is about the details such as looking for grammatical mistakes and typos, editing involves making much more substantial changes to your work. These pages offer guidance on efficient and effective editing. On a related note, if you wish to use a proofreading or editing service, it is important to be aware of the relevant ANU guidelines. Importantly, the guideline on thesis editing explains what constitutes acceptable editing practices.