More than 20 empirical studies have shown efficacy of SRSD approach to improving writing. Improvements have been shown in the quality, length and structure of writing pieces as well as planning, revision, content and mechanics.
Improvements have been maintained over time.
Useful Websites:
Free Resources-://thinksrsd.com/free-materials/
Free Resources- https://oodlesofteachingfun.com/2019/12/p-srsd-resources-html/
Teaching Videos https://www.teachinginthemiddlepd.com/resources.html
Fraction Math Strategy https://www.teachsrsdmath.com/srsd-resources
Find out the theory behind The Grammar Project by checking out the Writing Revolution book study.