Hi Roger,

In my opinion, use cases should be done before the wireframes, not the other way round. As you know, use case describes the interaction between the user or user types and the system. It does not exactly mean the interaction with the user interfaces of the application.

To answer your question, from the wireframes, if you could understand what the system/application does, when the users interact with it, you can draw the use cases. You would not have the correct use cases, if you capture them from each user interface.

 -Jessy