What we need is a uniformly accepted theory that explains the tort liability system in terms of its ultimate social function. The reason we don\u27t have one, I will argue, is that our understanding of the tort liability system has been skewed by an earlier, flawed attempt at descriptive theory. Before embarking on a new search for a descriptive theory, we first ought to formulate a search plan, sometimes called, forbiddingly, a theoretical methodology. Using John Finnis\u27s social science methodology, we can identify the two halves of the focal case of tort liability: intentional battery and negligent infliction of personal injury. Next, history provides the key to an accurate description of negligence liability because it identifies th...