From 1970 to 1985, the Scholastic Aptitude Test (SAT) underwent major modifications caused by: (1) the addition of the Test of Standard Written English (TSWE) to the College Board's Admissions Testing Program (ATP); (2) the passage of test disclosure legislation; (3) the institution of test sensitivity reviews; and (4) the use of item response theory equating in SAT scores. This report discusses these modifications as they relate to the SAT's content, format, development procedures, psychometric characteristics, and statistical procedures; and it concludes that despite these major modifications and other concomitant minor changes, the SAT has maintained its stability and continuity. Two figures and eight tables present study findings, and there is an appendix of SAT item-type examples. (Author/SLD)