The present study sought to understand teachers' beliefs and perceptions during Second Step implementation. The leading central question was stated: How do kindergarten through fifth grade teachers describe implementation of the Second Step Social Emotional Learning Program? The following research questions guided this qualitative study: R1: How do teachers describe any benefits to their teaching practice during the Second Step implementation process? R2: How do teachers describe and navigate challenges during the Second Step implementation process? and R3: What are teachers' recommendations with regard to modifying or continuing with the Second Step implementation process? Kurt Lewin's change theory provided the theoretical framework because the present study sought to explore restraining forces, driving forces, and teacher recommended modifications present during the unfreezing, moving, refreezing change process. The methodological approach was a qualitative case study using teacher one-on-one interviews that were transcribed and analyzed using an inductive approach that led to the creation of emergent themes reported in tables. Second Step implementation documents and teacher lesson plans provided information that augmented interview data and provided evidence to guide the interview question protocol. Fifteen kindergarten through fifth grade teachers from multiple Illinois elementary school locations participated in the research study. Five themes emerged from data analysis: Common Language, Time, Administrative Mandate, Lesson Planning, and Home Links. Each theme included subthemes that were aligned to driving forces, restraining forces, or teacher recommended modifications. Findings from this study allow administrators and teachers to develop and tailor fit practices in their school environment to further Second Step implementation. [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.]