| I think your system makes a lot of sense, and I would like to congratulate you on your writing. I can tell how much crunching is going on behind the scenes, and that inspires confidence! :-)
Now, a request! Could I hope for a condensed sheet, detailing just what you need in play (once you've digested the idea behind the system as well as the examples and mechanics).
From a quick overview only, what the DM needs would include (feel free to change this as you see fit):
* a (condensed) summary of "the basic skill challenge" on page 3
* the "primary skill concept"
* most if not all of page 4
* "Determining Skills Allowed for a Challenge" on page 5. That mental skills are go for mental challenges etc need no elaboration.
* "Awarding XP"
* Regarding "Player Options" (from page 3), I would say it could be useful to present this from another angle, instead explaining what an AP can be used for in a challenge, or what happens on rolling 20, etc.
If you could cram all of that into as little as one sheet (two pages) I'd be both impressed and grateful... And I think it would make Obsidian even better and easier to use! :-)
Zapp | 
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