Chang’s principal research interests lie in normative ethics, metaethics, action theory and moral psychology. Her work focuses on practical conflict, the nature of reasons and values and their relations, and rational agency. She is known for arguing that two items which are neither better nor worse than one another and yet not equally good may nevertheless be comparable: they may be ‘on a par’. Her work develops a view of rational agency, ‘hybrid voluntarism’, that grows out of her interest in the underdetermination of values and their associated reasons according to which agents can create reasons and values through commitment. She has also written on value pluralism and social choice. She has given various public lectures on decision-making, love, and commitment.