The UX functional specifications document is a communications tool: It is written in a formal way by which the interaction designer prescribes to the developers the desired behavior of the user interface. If you need to deliver such a document, your takeaways from this chapter should be the following:
Seek the development team's input and approval on the format and scope of the specifications, as early in the project as possible
Estimate early, and correctly, the effort involved in creating and generating the specifications
Start planning and testing the specifications output when you start your Axure file and continue testing and tweaking the output throughout the project
The tendency to postpone dealing with ...