The purpose of this study was to determine if one-to-one Chromebook use has an effect on student engagement and how one-to-one Chromebooks are used as an instructional tool. Specifically, what are the perceptions of middle school administrators and middle school core content-area teachers on one-to-one Chromebook use as an instructional tool and the effects on student engagement? The researcher identified six schools in the St. Louis Metro area that have implemented one-to-one Chromebook initiatives in grades six through eight and used purposeful convenience sampling to choose six administrators and twenty teachers to participate in this study. This study was comprised of a phenomenological qualitative approach. There were three methods used in order to collect data: interviews, online surveys, and focus group discussions. The findings of this study are significant to any district who may be considering launching a one-to-one Chromebook program. Eight major themes emerged based on one-to-one Chromebook use in middle school core content-area classrooms: increased student engagement, increased collaboration among students, increased opportunities for off-task behavior, no change in student engagement, increased web-based opportunities and resources as valuable instructional tools, increased individualized instruction, technological difficulties, and increased student-led instruction. Through the themes that emerged, this study shows that by implementing Chromebooks one-to-one, there appears to be an increase in student engagement and there are multiple ways to use Chromebooks as an instructional tool. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]