Neil Turner says it really well in his post, How to Create Great UX Documents. Amazing UX assets are: Useful – First and foremost a great UX document is useful to its audience. It clearly contributes to the overall goal of the work being undertaken– whether that’s to create a design, define a strategy or carry out some research. Appropriate – A great UX document is appropriate to its purpose, to the situation and to its audience. For example, an internal team document doesn’t need to look like a work of art. Equally a document that’s going to be widely circulated shouldn’t look like it’s been cobbled together in 5 mins. Usable – Just like a usable interface, a great UX document is easy to understand and use. Ideally it should be as self-explanatory as possible. Presentable – A great UX document doesn’t need to be a work of art, but it should be presentable (appropriately presentable if you will). Accessible – A great UX document should be easily accessible. It should be easy to find, easy to access and in a suitable file format.