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CMS Scientists were also involved in a number of model intercomparison activities. These included several GEWEX intercomparisons, including Case 5 of the Deep Convection Working Group that concentrates on the TOGA CORE period, and the Cross Pacific Intercomparison case, which spans the range from deep convection to stratocumulus (Williamson, Olson, Hannay, Kiehl, and Hack). Gettelman was the co-coordinator (w/ V. Eyring, DLR, Germany) of an international project to evaluate coupled chemistry climate models, a project conducted under the auspices of the Stratospheric Processes and their Role in Climate (SPARC) project of the World Climate Research Program (WCRP). These activities included organizing several major international workshops and contributing to ongoing scientific assessment efforts, including several publications feeding into the next WMO ozone assessment. The WACCM group co-authored a major paper on this subject, and I served as co-author of a chapter of the WMO ozone assessment and a reviewer of 2 chapters. CMS Scientists also continue to play leadership roles as members or chairs of many national and international committees including IGAC (Rasch, Chair), CLIVAR PSMIP (Hack, co-chair), AMS Committee on Atmospheric Radiation (Collins, Chair), DOE ASCAC (Hack), and WGNE (Hack).