Here's an interesting post concerning lists. Some of you engineering types (@Tikka) might already do this sort of thing. Functions, Not Lists!, by Travis K. - SurvivalBlog.com There's a lot of info there. One thing I pulled out was that the author suggests using a 'paired comparison spreadsheet' when having to decide what preps you should store or if you have to choose between two. It is a more scientific way to rank importance while removing personal feeling/emotion. I suggested something similar here: 9mm or .40S&W
Often I am not too sure your 95% stuff and 5% isn't more accurate than believed. I lurk quite a few websites and quite often the focus is "stuff." How many people have headed deep into a national forest for a week or more to test their BOB and skills? Those that plan to stay put, how many have analyzed their location as a defensive perimeter; how many even know how?