Figure 3: Improvement Model Asthma Health Disparities Collaborative Coalition Guide Source: Developed by Associates in Process Improvement. In: Langley G, Nolan K, Nolan T, et al. The Improvement Guide: A Practical Approach to Enhancing Organizational Performance. San Francisco: Jossey-Bass, 1996.Return to Document Current as of September 2007 Internet Citation: Figure 3: Improvement Model: Asthma Health Disparities Collaborative Coalition Guide. September 2007. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/nhqrdr/asthma-health-disparities/figure3.html