The problem addressed by this study was that School-wide Positive Behavioral Interventions and Supports (SWPBIS) is not consistently being implemented with fidelity by special education teachers in urban high schools in California, which can have negative academic and behavioral impacts on students with disabilities. This qualitative descriptive phenomenological study aimed to investigate special education teachers' lived experiences when implementing SWPBIS for special education students' behavior in one high school within a school district in California. Purposive sampling was used to acquire a sample size of nine special education teachers with a minimum of two or more years of teaching experience in this one large urban school. Participants responded to semi-structured, open-ended interview questions that addressed the research questions: What are special education teachers' lived experiences implementing SWPBIS for special education students' behavior? and What are special education teachers' lived experiences implementing SWPBIS to support special education students' academic achievement? The findings for the first question were (a) the SWPBIS student reward system and (b) positive school culture. The results for the second research question were (a) positive classroom learning environment and (b) SWPBIS classroom strategies. In this study, participants stated that SWPBIS created a positive learning environment. The shared lived experiences of the participants revealed that with the implementation of SWPBIS, they experienced a decrease in special education students' behavior problems. This study obtained data from only one population of special education teachers at one urban high school. It is essential to conduct further research using a representative sample of participants and educational institutions long-term. [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.]