In 2007-08, the WCPSS teacher absence rate was 10.3 days, slightly higher than a national rate of 9.5 days in 2004-05 but lower than the 11.3 to 14.6 days reported in large school districts more recently. In comparison with other studies, WCPSS teachers averaged smaller proportions of personal and sick leave days, slightly more annual leave days, and a higher proportion of administrative leave days. Teacher absences varied by years of experience and by schools' grade span and proportion of students receiving free or reduced-price lunch. Overall, there is some evidence, low but significant, of a negative relationship between teacher absences and mathematics achievement in two of six grades, but not in reading or six high school courses. These and other findings, including screening and costs of substitute teachers, are detailed in this report. The document includes the appendices: (A) Types of Teacher Leave, (B) Average Days of Absence Per School by Types of Leave: For 180 Instructional Days, 2007-08, and (C) Overall Mean Teacher Absence Rate per School for the 180 Instructional Days of 2007-08 (All Types of Leave Combined).