Is There Progress in Morality?

My question, which is central to the business of moral philosophy, is implicitly addressed by many philosophers, yet explicitly addressed by only a few. In this paper I address the question head-on, and propose a qualified affirmative answer. First, however, it is important to be clear about what is meant by ‘morality’ and ‘progress’, and what the meaning of ‘is’ is. My characterizations will not be exact, but I hope they will be precise enough to specify a domain that can be productively investigated.