This investigation is applied at developing critical thinking in student's in secondary educational, through the implementation of the Learning Strategy "APCIGDE" stimulating interpretation, analysis, evaluation, and inference of the topics developed in the teaching experience. This study aims to demonstrate the influence of the Learning Strategy "APCIGDE" in the development of critical thinking in the CT A, with student's from 4th grade of secondary educational in the National College of Agriculture "Posic" in the province of Rioja, Región Saint Martin. From the description and explanation of the phenomenon of study based on the theory of Piaget's active Learning, Learning theory and interactive Vygostky Learning theory of Ausubel significant; has hypothesise that the Learning strategy "APCIGDE" will significantly improve the ability of critical thinking in students in the 4th grade of...