In 2010, advances in structural design methods, combined with industry concern over product liability, brought both industry and research focus on the performance of traditional visual grading system for lumber over time. Forest Service researchers at the Forest Products Laboratory worked with the American Lumber Standard Committee Board of Review to assess the appropriateness of assigned design values for Southern Pine wood products. The board approves grading rules and engineering property design values for all structural lumber, foreign and domestic, sold in the United States. Architects, engineers, home builders, and building code officers all rely on these design values. The researchers provided the board with advice and counsel on the technical appropriateness of grade rule and allowable property changes for use in the United States. A series of tests on Southern Pine structural lumber completed in the fall of 2012 assessed the appropriateness of the assigned design values. The researchers reviewed the test results, and based on this review, the board modified the Southern Pine design values and adopted monitoring programs to determine the accuracy of design values of remaining structural lumber by all rule-writing agencies in North America.