This guide explains a very important aspect of sustainability and ISO 20121 that is reporting. It’s incredibly important to be aware of what impact your event is having by measuring and reporting after each event. This guide covers how to start with reporting, what you need in order to prepare for reporting. Then it moves on to explain some of the international frameworks that can be used to report or alternatives. The guide gives advice on how to decide which aspects of your event you will report on and understanding the reasons why you choose these aspects. The guide covers how to use your reporting to engage others, tell your story and the different areas to focus on based on your organisation.