Security procedures for the New Jersey High School Proficiency Test (HSPT) are discussed and evaluated. All New Jersey high school students are required to pass the HSPT, which was administered for the first time in 1984. Generally, security plans are designed to limit access to test questions prior to test administration and to prevent intentional misrepresentations of the score information that is generated from a test administration. Originally, security for the HSPT was delegated to local officials. Little documentation was required for test administration, and almost no monitoring was performed. Rumors of test security problems, combined with the possibility of fears of state "take-over" of local school districts, eventually lead to a formal monitoring procedure. Trained observers discovered several security problems. An 18-point security plan has been developed and implemented. Eleven points deal with unauthorized access to test forms before, during, and after test administration, while the remaining seven points deal with alteration of input (answer sheets). The procedures focus on addressing problems related to staff actions in the school district, rather than on problems relating to actions by students. Preliminary indications are that the goal of tightening security and protecting the validity of tests will be met. (TJH)