Hi,
Hmm, you should have received the Word document from NATS. It gives an overview of various aspects of ATC, and is important as it's what the motivation paper is based on.
Try going to
http://www.nats.gtios.com, logging in and sending NATS a message, alternatively if you give me your e-mail address, I can send the document to you.
Got my tests tomorrow... just looking over a few final things before going to bed!
Kirk