Computational thinking (CT) refers to a set of processes through which people arrive at solutions to problems using principles based in computer science. A CT approach to problem-solving is increasingly valuable in education and workplace settings as the economy grows more dependent on digital literacy. Given the importance of CT, it is essential to assess these skills. However, a reliable assessment tool is absent from the current literature. This chapter, therefore, defines CT across the Ontario (Canada) Elementary School curriculum in elementary classrooms and addresses the need for effective instructional strategies and assessment of CT-related problem-solving abilities. Finally, we establish where CT concepts and skills already exist or are missing from the curriculum and suggest a workable tool to assess CT based on existing literature.