Computational Thinking skills along with reading, writing, and calculating skills are basic skills for children’s future. Computational Thinking has much in common with problem-solving and creative thinking in general. With regard to Karl Popper "all life is problem-solving" [26], this contribution focuses on the common features of problem-solving and unplugged Computational Thinking, by using a special set of Computational Thinking tasks (INGA-Box). Choosing a mix of deductive and inductive approach, a classification scheme for observing the development of Computational Thinking in kindergarten was developed and evaluated with first datasets.