Each year, the Houston Independent School District (HISD) offers a summer education program designed to assist students with a variety of instructional needs. The 2015 summer education program allowed students the opportunity to repeat required courses needed for promotion, to get ahead by taking required courses before the next school year, or to receive specialized instruction on the basis of eligibility. Summer school programs in 2015 included accelerated instruction for STAAR and EOC retesters; credit accrual/recovery for students needing to graduate; remediation for secondary English-language learners (ELL); SAT/PSAT preparatory classes; and other school-based programs. The summer education program supports HISD's Strategic Direction Core Initiative 3: Rigorous Instructional Standards and Supports. The tables and figures show student enrollment and outcomes for students who attended summer school in 2015. The tables and figures are arranged in four groups: (1) Tables 1-12 and Figures 1-4 describe the students who were promoted or retained after spring 2015 and summer 2015; (2) Table 13 describes elementary and middle school outcomes as assessed by the posttests associated with the curriculum resources; (3) Tables 14-15 describe the performance of retesters on the summer administrations of the STAAR grades 5 and 8 and STAAR End-of-Course exams; and (4) Tables 16-17 describe the courses enrolled in and completed by high school students.