{subsection: motivation} -A user of your HTCondor pool, Dr. Needs-Moore, needs more cycles in less time than your pool can provide. (This can happen for any number of reasons, but deadlines are a good and sufficient one.) However, Dr. Needs-Moore has money they're willing to spend on solving this problem. Solution: trade Dr. Needs-Moore's money for cycles. Enter the cloud. +A user of your HTCondor pool, Dr. Needs-Moore, needs more cycles in less time than your pool can provide. (This can happen for any number of reasons, but deadlines are a good and sufficient one.) However, Dr. Needs-Moore has money to spend on solving this problem. Solution: trade Dr. Needs-Moore's money for cycles. Enter the cloud. {subsection: constraints}