We live in a century where technology has become part of our lives, and it is crucial that we become active creators of technology, not just passive users. Learning to program computers enables a person to create twenty-first-century solutions. Computer programming is more than just learning how to code; it also exposes students to the opportunity to develop computational thinking (CT), which involves problem-solving using computer science concepts. In this chapter, we explore strengths and weaknesses of students´ CT skills and compare a group of seventh- and eighth-grade students who engaged in a Scratch programming environment. Scratch is a popular visual programming language that introduces computer programming to youth. We use Dr. Scratch, a CT assessment tool, to analyze students´ Scratch projects for evidence of CT. The results of this study can show researchers and educators how they might use Dr. Scratch to analyze students´ Scratch data to help improve their CT.