This report provides information on the conduct of students in Delaware public schools during the 1999-2000 school year. The focus of the analysis is on reported incidence of serious student conduct offenses as defined by Delaware Code or as defined by Delaware State Board of Education regulations and reported incidence of student suspensions and expulsions. The bulk of the report presents data tables in six areas: (1) number of reported serious student offenses and number of student offenders; (2) characteristics of most commonly reported serious student offenses; (3) characteristics of students most frequently reported for serious offenses; (4) number of suspensions and expulsions and number of students suspended/expelled; (5) infractions resulting in suspension/expulsion; and (6) characteristics of students most frequently suspended/expelled. Student conduct data were disaggregated by demographic populations and comparisons made with the previous school year. The data suggest that Delaware school districts are making progress in reducing incidents of serious student conduct. Most reported offenses were for assault, offensive touching, and possession of controlled unlawful substances. Most suspensions were for defiance of school authority, fighting, general disruption, and profanity. Groups having a higher incidence of serious behaviors/suspensions included ninth graders, males, and African-American students. The report concludes with recommendations regarding the need to develop more effective strategies for dealing with serious student offenses, to investigate causes of the high incidence of African-American males suspended for defiance of school authority and devise strategies to address this issue, and to make revisions in the reporting form to better ensure data integrity. Data summaries by district and school are appended. (KB)