This, to me, is the heart of it. As other responses have pointed out, BPA is not a clearly defined thing; I don't think it's "subjective" as one person put it, but it's definitely subject to great "uncertainty". In particular, you have only an estimate of a guy's floor, and an even less clear estimate of his ceiling. If your scouting is weak, you give everyone a high ceiling (could be a star) and a low floor (could be a bust). If you have good scouting, the estimates have more shape, but they still involve a lot of room, particularly for the HS players. You could end up graphing the results, looking something like this (quickest decent example I could locate, from a totally different context): and if you are drafting high in the first round then maybe one bar like the one in the middle appeals to you, or maybe the one on the left with the higher floor seems like the wiser pick. You might resort to some further analysis regarding risk, to compute some kind of Expectation Value, and that might be the dots on that graph. If any player stands out like this, according to whatever your taste for risk, IMO you take him, regardless of position. However, once past the top 5, at most 10, the bars on the chart for the best players remaining will start to look awfully similar to each other. Then, you pick among those best, according to positional need. Again, IMO. This is why the debate of BPA vs Need always strike me as futile. You normally just don't know enough to really know who the BPA is, until about 10 seasons later. Buxton is turning out to be a great pick at #2 last year, kudos to the scouting team; locating a similar clearcut BPA at #4 will be tougher.