Spring 2015 marked the end of a three-year pilot program that the National Association of Independent Schools (NAIS) and the NAIS Commission on Accreditation sponsored on school use of the High School Survey of Student Engagement (HSSSE), created and administered by Indiana University. To better understand the student experience, HSSSE investigates the attitudes, perceptions, and beliefs high school students hold about their schoolwork, their learning environment, and their interaction with their school community. The pilot was designed with three main goals: (1) helping schools assess their effectiveness, especially on student progress related to 21st century skills; (2) giving schools an option to comply with learning assessment standards without using standardized achievement tests; and (3) capturing data that shows the value-add of an independent school education. In 2015, more than 12,500 students from 58 NAIS-member schools participated in HSSSE. Students answered questions organized under three categories: (1) cognitive, intellectual, and academic engagement; (2) social, behavioral, and participatory engagement; and (3) emotional engagement. Overall, the 2015 HSSSE results for the NAIS group of schools were very positive. Almost all of the schools' engagement scores were higher than their public school counterparts by statistically significant amounts. The pilot project is over, but NAIS continues to work with interested schools. HSSSE provides participating schools with detailed feedback on the conditions that make for successful school experiences. It also offers schools several indicators of what they are doing well and what they could do better to improve the student experience. This past spring, NAIS started offering HSSSE to all of its members. A middle school version of HSSSE is also available