[EN] This study covers 5 years of systematic surveys of self-perception of students about some core skills. The study incudes all students of 3rd year of Agricultural Engineering (currently Graduate on Agricultural and Rural Engineering), during the subject “Technologies of animal production”. The main objective was to gather information in order to design specific activities for developing core skills during this subject. We also tried to identify changes occurred in the students during the transition to the new study plans. After several courses conducting informal surveys, from course 2010-2011 a common survey model was answered by the students. The survey consists of 27 questions on a Likert scale of 5 levels. As a result, and considering the limitations of this kind of surveys, a general overview of the evolution of different skills was obtained. The results of this survey were essential to properly design the subject during this transition to the new plans. According to the survey results, we covered some detected deficiencies (e.g. use of AutoCad) and this contributed to maintain very positive subject indicators: approval rate over 80% and positive evaluation (between 8 and 9) by students in official surveys