To give some background, I'm currently getting my PhD in engineering, and if its anything i've learned, you can fit a formula to at least approximate a model for anything. Given that, I'm trying to create a tool that, given your needs, can put a number of cents that each award mile is worth that is a little more objective than the valuations that TPG gives, for example. I was just wondering what you all thought the contributing factors are for valuation (ie. ease of accrual, awardspace, etc)?