state and national advisory committees related to educational testing, assessment, and evaluation, including the committee responsible for the 1999 revision of the Standards for Educational and Psychological Testing. He is a fellow of the American Psychological Association and is a member of the National Academy of Education. He holds a Ph.D. from the University of Chicago.

David Hubble is a senior statistician at WESTAT with extensive experience in designing, planning, and conducting demographic surveys and census evaluations at the U.S. Census Bureau. At WESTAT, his work has involved the National Assessment of Educational Progress, the Minnesota Adult Tobacco Survey, and other survey design and technical assistance projects. His work covers many aspects of survey implementation, including survey design, sampling frame creation, sample selection, data collection methods, missing data mitigation, weighting procedures, estimation techniques, variance estimation, methodological investigations, and experimental designs. He holds a B.A. and an M.A. in statistics, both from Boston University.

Judith A. Koenig (Costudy Director) is a senior program officer with the Board on Testing and Assessment of the National Research Council (NRC). She has worked on a number of projects related to assessing English language learners, as well as an evaluation of the assessments used by the National Board for Professional Teaching Standards, a project to recommend standards for the National Assessment of Adult Literacy, and a report on methods for calculating dropout and graduation rates. Prior to joining the NRC, she was a senior research associate with the Association of American Medical Colleges where she directed operational programs for the Medical College Admission Test and led a comprehensive research program on the examination. She has a B.A. in special education from Michigan State University, an M.A. in psychology from George Mason University, and a Ph.D. in educational measurement, statistics, and evaluation from the University of Maryland.

Rebecca Kopriva is a visiting professor at University of Wisconsin-Madison, working with the Wisconsin Center on Educational Research. Previously, she was on the faculty at the University of Maryland, where she served as director for the Center for the Study of Assessment Validity and Evaluation (CSAVE) in the College of Education. At CSAVE, her work focused on improving the quality and accuracy of data about students and schools, with a particular focus on addressing ways large scale psychometric theory and practice can be improved to better incorporate the needs and strengths of diverse student populations. Prior to that position, she served as director of student assessment for the state of Delaware. Much of her research focuses on the issue of assessing English language learners, and she recently served as consultant on the English Language Development Assessment on the validity of the assessments. She holds a Ph.D. in applied statistics and research methods from the University of Northern Colorado.

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