Students with disabilities have progressed in achievement compared to their general education peers, but learning gaps remain. The problem is elementary and secondary school students with disabilities have achievement gaps despite receiving specially designed instruction through an individualized education program by an intervention specialist in rural Ohio. A gap lies in that the research needs to detail the perceptions of general and special education teachers, specifically in the chosen Ohio school district. The purpose of this basic qualitative study was to explore the effectiveness of co-teaching on academic achievement gaps of students with disabilities among general education and special education teachers. Two theoretical frameworks were used: constructivist and zone of proximal development. They are based on the notion that adults can assist students in acquiring new knowledge by building upon what is known to fill gaps in what needs to be known. Research questions focused on gaining the perceptions of general and special educators on the effectiveness of co-teaching to close achievement gaps for students with disabilities. A sample of 16 teachers was selected by convenience and purposeful sampling in an Ohio school district. The data instrument was a semi-structured interview. Data collection was conducted via audio-visual recorded Zoom sessions, with analysis conducted through seven analytical steps by hand. Interpretations and conclusions include that general education and special education teachers agree that co-teaching contributes to closing the achievement gap for students with disabilities. Recommendations for further research include long term impact of coteaching and professional development effectiveness. [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.]