Most of the work on field quality in superconducting magnets reported here was done with my colleagues at the Brookhaven National Laboratory (BNL). I would like to take this opportunity to acknowledge all of them. In particular, Mike Anerella, Mike Harrison, Animesh Jain, Steve Kahn, Gerry Morgan, Pat Thompson, Peter Wanderer and Erich Willen played a major role in various ways (direct contribution, discussion, feedback, encouragement, etc.). Thanks. - Ramesh.