Forgive me, since I am completely ignorant on this issue, but I dont understand why some residencies are so tough to get into. I hear about stuff like match rate and unfilled slots.. for example I thought I heard somewhere that one of the residencies has a 15% unmatched rate and thats indicative of a very tough residency to get into. But doesnt that mean that 85% of all applicants to that residency matched somewhere? That seems very good considering the acceptance rate for med school is only about 40% or so. I realize that the people you are competing against for residencies are much more accomplished than for admission to MD programs, but still an 85% acceptance rate is very high. Also, of what significance is the number of unfilled slots for a particular residency? Does that mean: 1) that nobody applied for those particular residencies 2) that the residency program received too few applicants so they just decided not to take anyone 3) that nobody in the applicant pool was qualified for the position?