Written expression can be a critical skill for academic, vocational, and social pursuits. Unfortunately, research suggests that students with intellectual and developmental disabilities (IDD) struggle to develop writing skills. Paragraph text-writing is a component of written expression and refers to constructing multiple sentences about a singular topic with appropriate capitalization, punctuation, and grammar. The present study investigated the effects of a multicomponent intervention of explicit instruction and timed practice on the paragraph text-writing skills of four secondary student with IDD. The study included four dependent measures (paragraph text-writing rubric, total words written, and correct and incorrect writing sequences) and used a multiple-probe across participants design. Visual analysis and effect sizes revealed modest results. Three participants showed improvement on at least one of the dependent measures; one participant showed no improvement at all. The practical implications of this study are discussed within the context of existing writing literature, and the limitations are presented. [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.]