THE PRESENT STUDY SEEKS TO VALIDATE A CHILEAN ADAPTATION OF THE CAPS SCALE, OF SPANISH ORIGIN, IN CHILEAN PRIMARY SCHOOL STUDENTS, THROUGH THE ANALYSIS OF PSYCHOMETRIC CHARACTERISTICS. THE PARTICIPANTS WERE 1195 CHILEAN STUDENTS BETWEEN THE AGES OF 10 AND 17 YEARS OLD (M = 12.5; D.E. = 1.38); THE INSTRUMENT USED WAS THE CHILD-ADOLESCENT PERFECTIONISM SCALE (CAPS). THE DIMENSIONALITY, RELIABILITY, AND FREQUENCY RANGES OF THE TEST WERE ANALYZED IN THE SAMPLE. THE RESULTS GIVE AN ACCOUNT OF THREE DIMENSIONS, WITH A HIGH GENERAL RELIABILITY LEVEL OF .89, ACCORDING CRONBACH'S ALPHA; AND AN ADEQUATE LEVEL IN ITS DIMENSIONS, ALPHA VALUES BETWEEN .722 AND .794. IT IS ALSO OBSERVED IN THE SAMPLE THAT THE EFFORT-ORIENTED PERFECTIONISM (EOP) IS THE CHARACTERISTIC WITH THE HIGHEST SCORE, WHILE THE SOCIALLY PRESCRIBED PERFECTIONISM (SPP) CHARACTERISTIC THE LOWEST. IT IS CONCLUDED THAT THE INSTRUMENT HAS ADEQUATE PSYCHOMETRIC CHARACTERISTICS, AND THAT THE SOCIALLY PRESCRIBED PERFECTIONISM, A NEGATIVE FEATURE OF THE PHENOMENON, ACCORDING TO WHAT IS OBSERVED, IS LESS DEVELOPED IN THE PARTICIPATING GROUP, WHICH WOULD STRENGTHEN SOCIO-EMOTIONAL DEVELOPMENT.