Abstract: In 2015 a curriculum framework for Computational Thinking was developed for lower secondary education in the Netherlands. The framework is based on ISTE and CSTA, translated for the curriculum in the Netherlands and validated by experts, teachers, teacher educators and publishers. Based on this validated curriculum a new learning trajectory was designed for primary education, in collaboration with teachers and principals from three schools. The first version of the learning trajectory consisted of intermediate goals around coding and programming with unplugged learning activities to make implementation as easy as possible for teachers with little experience with CT. Many schools adopted the learning trajectory for coding and programming enthusiastically. The goal for next year is to design and validate a further developed learning trajectory for primary and secondary education, covering all topics of CT and including both unplugged and hands-on plugged experiences learning activities.