Great Resource on Halacha Theory -- NLE Resources

I came across this a few minutes ago and it appears to be an astounding resource on Halachic theory (LINK).  On the right of the page, there is a menu titled "How to Use NLE Class Materials."  Towards the bottom of that menu, there is a section titled "The System of Halacha."  Within that section are 9 PDFs that look to be very informative.  Enjoy.