I've heard 16 is a good rule of thumb for most schools, but once again, every school has their own standard. Some schools have their DAT minimums posted on their website: UOP is 16 on every section, Tufts is 16/16/15...I've heard Indiana's is 16 on all sections (except reading--18). I find it hard to believe however, that if you've got a section that doesn't meet the minimum and you've got terrific other scores (21+) that they won't make exceptions. I could be wrong, however. I ended up getting a 15 on math, but I've got 2 interviews lined up already.