This mixed-methods ethnological research study examined general education and special education teachers' perceptions of preparedness to include students with significant behavioral disabilities in the general education environment. The study used concepts within social cognitive theory (Bandura, 1986) to understand possible connections between variables. The instruments and framework used in this study answered the three research questions posed. Quantitative data were collected during this study using the TPSD (Aldabas, 2020), inclusive of independent variables with two categorical levels: general education and special education certification. Qualitative data were collected from participants using open-ended survey questions and a focus group discussion to measure the dependent variable, teachers' perceptions of preparedness. Collected quantitative data were analyzed using mean, t-test, and MANOVA to determine the relationship between independent variables, teacher certifications, and dependent variables, teachers' perceptions. Collected qualitative data were examined and triangulated with the quantitative data collected to derive meaning and narrative information from participating teachers' revealing an understanding of teachers' perceptions of their abilities. This research concluded that there are no significant differences between general and special education teachers' perceptions of preparedness to include students with significant behavioral disabilities in the general education environment. Moreover, this study has revealed that a majority of general education teacher and special education teacher participants desire additional training to feel efficacious in working with students with significant behavioral disabilities in the general education environment. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]