In School Motivation context, we know that it is not enough with taking in consideration the student’s task motivation. It is necessary also consider the perspective of the reasons of students that give sense to the school learning, and this way improve or re-thinking the didactic designs.In this frame, we have developed a tool (SAS-student) that allows characterizing the School Learning Sense. The validation of this instrument was done on a sample of 405 Chilean students (male and female) of 6th primary (11 years) and 5th secondary (16 years), representatives of different Socio Economics Status. The psychometrics characteristics of this tool show the same factorial structure in both levels, appropriates reliabilities coefficients and a high level of discrimination. These results come to support the construct validity and reliability of a test that not only is useful for the research but also it gives to teachers potentially relevant information for theirs pedagogic planning
