This chapter focuses on mathematics and computational thinking. In each chapter, the practice is dissected into distinct and clear learning tasks that serve as process goals for learning the practice. These tasks are then examined within the context of a self-regulated learning cycle and coaching strategies for instruction and assessment are emphasized. The instruction and assessment strategies are contextualized for students in grades 9–12 and focus on conducting an investigation on the factors influencing the period of a pendulum. The data practices for the investigation are infused with computational thinking. The tasks are reassembled into two case studies focused on the heating curve of water– one positive and one negative – to demonstrate how the learning tasks can be used by students and how teachers can support students learning how to plan and carry out investigations.