The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
Unfortunately I cannot answer the question as I have never done RUP or AUP. I have read about both but I don't think that gives me the necessary experience to answer the question. There may be others on this list that can answer that question for you. I suggest you start on Scott Ambler's website http://www.ambysoft.com/unifiedprocess/agileUP.html where you can read first hand what AUP is about, and can then compare it to RUP (which I guess is what you are practicing now).
Co-author, with Lisa Crispin: Agile Testing: A Practical Guide for Testers and Agile Teams (Addison-Wesley, 2009) www.janetgregory.ca
What AUP lacks when compared to RUP, being a subset of RUP?
I'm not really familiar with AUP either, but I think it must have something in common with OpenUP. Agility and Discipline Made Easy: Practices from OpenUP and RUP by Kroll and MacIsaac has a pretty comprehensive explanation of OpenUP and its agile aspects.
Co-author, with Janet Gregory: Agile Testing: A Practical Guide for Testers and Agile Teams (Addison-Wesley, 2009) http://lisacrispin.com
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