Taxonomy is essentially another word for categorization that also has key principles which then explain each subset of the categories. In the social investment world, it can be used to categorise the reasons why organisations want to take on investment as it's extremely beneficial to fund managers and other stakeholders to be able to see trends, themes and potential opportunities. Keeping it clear and comprehensive is key to creating a successful taxonomy, so that users and readers can clearly understand how to use it and why it is useful.