Disciplines Disability and Equity in Education | Special Education and Teaching Publication Date 2021 Document Type Article DOI 10.25778/3v8r-nb42 Abstract We conducted a review of the literature on articles published between 1990 and 2020 that measured the effects of progressive time delay (PTD) on skill acquisition in students with autism spectrum disorder (ASD). In all, 11 experimental research articles, each of which employed a single-case methodology, were deemed appropriate for our review.