The effects of training in Universal Design for Learning (UDL) on lesson plan development of special and general educators in a college classroom environment were investigated. A true experimental group design with a control group was used for this study. A one-hour teacher training session introduced UDL to the experimental group; the control group received the intervention later. A three-factor analysis of variance with repeated measures was completed for each of the dependent variables (i.e., UDL lesson plan). Differences were found between pretest and posttest measures for both treatment groups for special education and general education teachers. The results suggest that a simple introduction to UDL can help teachers to design a lesson plan accessible for all students.