[American Society of Civil Engineers ATC and SEI Conference on Improving the Seismic Performance of Existing Buildings and Other Structures - San Francisco, California, United States (December 9-11, 2009)] Improving the Seismic Performance of Existing Buildings and Other Structures - Recommended Directions for IEBC Appendix Chapter A4: Earthquake Hazard Reduction in Existing Wood-Frame Residential Buildings with Soft, Weak, or Open-Front Walls