Here are just a handful of the research articles describing the efficacy of our methods
Adams, Gary L., and Siegfried Engelmann. Research on Direct Instruction: 25 Years beyond DISTAR. Educational Achievement Systems, 319 Nickerson Street, Suite 112, Seattle, WA 98109, 1996.
Baird, Joseph, and Sorah Stein. "To SAFMEDS or not to SAFMEDS? A student compares two methods to learn vocabulary terms in an undergraduate course in applied behavior analysis." (2013).
Baumann, James F. "The effectiveness of a direct instruction paradigm for teaching main idea comprehension." Reading Research Quarterly (1984): 93-115.
Beverley, Michael, J. Carl Hughes, and Richard P. Hastings. "What’s the probability of that? Using SAFMEDS to increase undergraduate success with statistical concepts." European Journal of Behavior Analysis 10.2 (2009): 235-247.
Bolich, Barbara, and William J. Sweeney. "An eleven-year old girl’s use of repeated readings, SAFMEDS, and see/write-think/write practice to develop fluent reading in Hebrew." Journal of Precision Teaching and Celeration 14.1 (1996): 41-56.
Casey, Julie, et al. "The effects of five minute practice, unlimited practice, with SAFMED cards on correct and error rate in math facts for two elementary school children with learning disabilities." International Journal of Special Education 18.1 (2003): 66-72.
Graf, S. A. "How to develop, produce and use SAFMEDS in education and training." Poland, OH: Author (1994).
Hunter, Stacey H., et al. "Increasing high school students’ math skills with the use of SAFMEDS class-wide." European Journal of Behavior Analysis (2016): 1-12.
Lindsley, Ogden R. "Precision teaching: Discoveries and effects." Journal of Applied Behavior Analysis 25.1 (1992): 51-57.
Lindsley, Ogden R. "Precision teaching: By teachers for children." Teaching Exceptional Children 22.3 (1990): 10.
Lindsley, Ogden R. "Why aren't effective teaching tools widely adopted?." Journal of Applied Behavior Analysis 25.1 (1992): 21-26.
Lindsley, Ogden R. "Precision teaching's unique legacy from BF Skinner." Journal of Behavioral Education 1.2 (1991): 253-266.
Quigley, Shawn Patrick. "An Evaluation of Various SAFMEDS Procedures."