The Success By 6® (SB6) initiative is designed to support early care and education centers in improving and sustaining quality in Pennsylvania's Keystone STARS Quality Rating and Improvement System (QRIS). The SB6 evaluation report examines implementation and outcomes. The findings have implications for SB6 continous quality improvement process and can inform the broader field of ECE quality improvement. SB6 is at a point in implementation that is ideal for reflection and evaluation. This Program Design appendix accompanies the report and analyzes whether and how the key components of SB6 align with effective practices in early care and education quality improvement. We also provide recommendations for SB6 design. [For the full report, the executive summary, and the technical appendix, "Improving Quality for Child Care Centers in Greater Philadelphia: An Evaluation of Success by 6®. Final Report. Publication #2016-07," see ED579959; "Improving Quality for Child Care Centers in Greater Philadelphia: An Evaluation of Success by 6®. Executive Summary. Publication #2016-07A," see ED579960; and "Improving Quality for Child Care Centers in Greater Philadelphia: An Evaluation of Success by 6®. Technical Appendix. Publication #2016-07B," see ED579961.]