This report provides a rapid review of definitions of organisational inclusion, and how best to measure it. Although the term ‘diversity’ was not included in the question, many of the resources were found to explore the term in a way that was deemed relevant to the current query. The scope of the report did not allow for complex judgements to be made about the quality of the body of evidence, or of the strength of individual pieces of evidence. However, it should be noted that in writing this report, a large number of resources were used that would not be considered ‘evidence’ under the stipulations contained within the UK Department for International Development’s How to Note on Assessing the Strength of Evidence . Therefore, caution should be taken in using this report as a basis for assumptions about what best practice might look like to define and measure inclusion within an organisation. This report was written in five days. It is designed to provide a brief overview of the key issues, summarised within the time permitted. The author recognises that the review process was non-systematic and non-exhaustive. All the resources included were in English, no more than 10 years old, apart from two older resources that were included as they were deemed to be relevant.