AHRQ is sponsoring a webinar on the concept of fuzzy set analysis on April 15 from 1:00 to 2:00 p.m. EDT. Fuzzy set analysis is a mode of analyzing data using set membership and configurational analysis. The mode allows researchers to calibrate partial membership in sets using values in the interval between 0 (non-membership) and 1 (full membership), without abandoning core set theoretic principles. The presenters are Marcus Thygeson, M.D., associate medical director, Health Partners, and Jodi Holtrop, associate professor, Department of Family Medicine, Michigan State University. The moderator is Michael Harrison, Ph.D., senior social scientist, AHRQ. Four other webinars will be held on May 14, June 4, July 15, and a yet to-be-determined date in December. The webinars will focus on planning, executing, analyzing, and reporting research on delivery system improvement. Select to register for the webinar.