Qualitative research focused on the development of critical reading skills with eleventh grade students from the Llano Grande Integrated School, located in the municipality of Giron, Santander. Through various activities framed within a didactic unit as a teaching-learning strategy, it is possible to strengthen four activities in critical reading following the theoretical conceptions of Marquez and Sanmarti (2011) and Oliveras and Sanmarti (2009), called: main idea and basic information , make inferences, evaluate, judge and confront ideas. The collective case study is the instrument that allows the collection of data that account for those skills acquired by participating students throughout the research process.