Although various phenomena are often included under the general heading of prominence-sensitive stress, weight sensitivity and sonority sensitivity are the canonical examples. In weight-sensitive systems, stress is attracted to syllables with a greater number of moras at the expense of syllables with a lesser number. In sonority-sensitive systems, stress is attracted to syllables containing vowels of greater sonority at the expense of syllables containing vowels of lesser sonority. In this article, I will first develop an analysis of weight sensitivity, and then I will extend the analysis to sonority sensitivity. The aim is to provide a general and uniform account of both phenomena.