Question: Design Defect. In May 1995, Ms. McCathern and her daughter, together with McCathern's cousin, Ms. Sanders, and her daughter, were riding in Sanders's 1994 Toyota 4Runner. Sanders was driving, McCathern was in the front passenger seat, and the children were in the back seat. Everyone was wearing a seat belt. While the group was traveling south on Oregon State Highway 395 at a speed of approximately fifty miles per hour, an oncoming vehicle veered into Sanders's lane of travel. When Sanders tried to steer clear, the 4Runner rolled over and landed upright on its four wheels. During the rollover, the roof over the front passenger seat collapsed, and as a result, McCathern sustained serious, permanent injuries. McCathern filed a suit in an Oregon state court against Toyota Motor Corp. and others, alleging in part that the 1994 4Runner "was dangerously defective and unreasonably dangerous in that the vehicle, as designed and sold, was unstable and prone to rollover." What is the test for product liability based on a design defect? What would McCathern have to prove to succeed under that test?