The objective of this research is to study the way in which Primary Education students solve pattern generalization problems. For this, the level of success, the strategies used and the progression of 106 students in 3rd, 4th, 5th and 6th years of Primary Education have been analyzed by solving a pattern generalization problem. The results obtained show that the most successful students start with additive strategies and then switch to functional strategies, that reversing the process presents a higher cognitive demand and that very few students are able to express the general rule algebraically. The analysis of student progression has allowed us to define descriptors of a learning trajectory that help diagnose students' understanding and describe their progress in terms of growth through ten levels of development.
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