A comprehensive review was conducted of writing research literature and writing test program activities in a number of testing programs. The review was limited to writing assessments used for admission in higher education. Programs reviewed included ACT, Inc.'s ACT program, the California State Universities and Colleges (CSUC) testing program, the College Board's SAT program, the Graduate Management Admissions Test (GMAT) program, the Graduate Record Examinations (GRE) test program, the Law School Admission Test (LSAT) program, the Medical College Admission Test (MCAT) program, and the Test of English as a Foreign Language (TOEFL) testing program. Particular attention was given in the review to writing constructs, fairness and group differences, test reliability, and predictive validity. A number of recommendations are made for research on writing assessment.