Full-scale test results of the MIDPLY™ wall system are presented along with the test results obtained on nailed joints with single and double shear planes. Research findings to date indicate that MIDPLY™ shear wall is a cost effective wall system, which has superior lateral load resistant capacity when compared to standard wood-frame shear walls. The effects of nail type and spacing, number of shear planes, panel type and thickness, vertical loads, exterior sheathing, and end stud configuration on the lateral load carrying characteristics of MIDPLY™ wall system are studied. Comparisons with the standard shear wall system are made. Based on the findings in the first year, a standard MIDPLY™ shear wall system is selected and will be used as the basis in the second year of this project. An industrial advisory group including two prefabricated home manufacturers, and a major wood products producer was established. A meeting of this group took place where key issues were discussed.