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iii Foreword Each year a large number of written documents are generated by NCES staff and individuals commissioned by NCES which provide preliminary analyses of survey results and address technical, methodological, and evaluation issues. Even though they are not formally published, these documents reflect a tremendous amount of unique expertise, knowledge, and experience. The Working Paper Series was created in order to preserve the information contained in these documents and to promote thedoi:10.31014/aior.1993.01.01.28 fatcat:wedjuvsybzg5tltm325paaxi3y