the federal level to enact a uniform federal product liability regime were unsuccessful. From the mid-1960s onward, state courts struggled for over four decades to develop a coherent test for design defects, either phrased in terms of consumer expectations or whether risks outweigh benefits or both (i.e., a hybrid test in which the first does not apply to defects that are too complex). Risk-benefit analysis, of course, can be seen as a way of measuring the reasonableness of the defendant's conduct—or in other words, negligence. A neo-conservative turn among many American courts and tort scholars during the 1980s led to a recognition that liability in design defect and failure-to-warn cases had never been entirely strict, or had been operating in some respects as a de facto fault-based regime all along, and the American Law Institute expressly backed a return to tests associated with negligence for design and warning defects with the 1998 publication of the Restatement of Torts, Third: Products Liability. This attempt to resurrect negligence and to limit strict liability to its original home in manufacturing defects "has been highly controversial among courts and scholars." In arguing in 2018 that U.S. product liability law as restated in 1998 had come full circle back to where it started in 1964, two law professors also conceded that "some courts" continue to "tenaciously cling[] to the rationale and doctrine of [Section] 402A." Types of liability Section 2 of the Restatement (Third) of Torts: Products Liability distinguishes between three major types of product liability claims: Manufacturing defect Design defect Failure to warn (also known as marketing defects) However, in most states, these are not legal claims in and of themselves, but are pleaded in terms of the legal theories mentioned above. For example, a plaintiff might plead negligent failure to warn or strict liability for defective design. The three types of product liability claims are defined as follows: Manufacturing defects are those that occur in the manufacturing process and usually involve poor-quality materials or shoddy workmanship. In other words, the defective product differs from the others on the same assembly line and does not conform to the manufacturer's intended design. Design defects occur where the product design is inherently dangerous or useless (and hence defective) no matter how carefully manufactured. In other words, the defective product is the same as every other one on the same assembly line because it is exactly what