Many students, especially English language learners (ELLs), struggle with writing expository texts. This study examined the impact of several writing strategies on ELLs' writing skills, including prewriting strategies and scaffolding strategies inherent in the Thinking Maps (TM) program. The purpose of the study was to see if ELLs were able to use these strategies to express their ideas more effectively in compositions in a more organized way. The participants were 8 students in grades 3 through 5 in the South Bay School District. The students were participating in an after-school writing class 2 days a week for 6 months. As a result, the overall average of students' writing scores in the areas of "Ideas" and "Organization" increased. While the overall averages were below the proficiency level (3.0), these writing strategies can be seen as having a positive impact on ELLs' writing skills.