A huge amount of the final stage of Warcraft is progression at end game. You can do dailies, or RP to your hearts content, but most players are trying to get the even diminishing returns that comes with improving their gear.
Knowing what gear you should be aiming for is critical; which requires understanding of stats and a bit of math.
Percentages of Ratings, tweaks in dps stats, and all sorts of figures and interrelated numbers that make the small but noticeable difference. Some awesome bloggers, forums, and webpages publish “Best in Slot” or “new to 80s” gear lists. Others even tell you where to find the upgrades. This is golden advice and very often easy to follow.
However if you want to verify an item, dig for what more subtle upgrades you need next, or even just qualify that what you have is reasonable; you’ll need a personal-gear-advice-slave, or some skill with a gear website.
Q. But what if you want to do it yourself, but fear the math?
A. Well you can read on to find out how I do a series of simple steps to create lists of items that are desirable. Teach a man to fish….etc. However the best results are gained if you embrace a little theory, and start crunching.
Warning: This is a long article.