Emergent writing--the process where young children begin to experiment with written language--is an important contributor to the development of literacy skills. One way for teachers to support the development of writing skills in preschool-aged children is by integrating the Classroom Assessment Scoring System (CLASS) as a framework to foster emergent writing. CLASS is a widely implemented and in some cases mandated tool that many teachers currently utilize as a guide for best practices and to measure the quality of their interactions with students. Teachers can use the CLASS tool to identify opportunities for writing, organize the environment to support emergent writing, enhance interactions that lead to idea development, implement instructional support for writing, and integrate writing across curriculum areas, linking language development and content knowledge. This article demonstrates how to effectively integrate CLASS as a means of teaching and supporting emergent writing.