An 11-year-old U.S. fifth grader with a diagnosis of autism spectrum disorder (ASD) participated in a writing intervention using the self-regulated strategy development (SRSD) approach for story writing. The child summarized stories adapted from the Read Works® website using POW (Pick my idea, Organize my notes, and Write and say more) and WWW, What = 2, How = 2 (W = Who are the characters?, W = When does the story happen?, W = Where does the story happen?, What = 2, What happens first?, What happens next?, How = 2, How does the story end? and How do the characters feel?). Based on correct word sequence (CWS) calculations, the participant increased CWS from pre-test to post-test, and the total number of words she wrote also increased. This case study aims to provide speech-language pathologists with a guide for implementing the SRSD approach with their students with ASD and to inform future research.