After a brief introduction on the evolution of measuring instruments for cognitive and non-cognitive factors in students’ learning , the 28-item Survey Attitudes Towards Statistics (SATS ) scale is applied on a sample of 135 students attending introductory statistics in the Sociology and Social Service courses at «Sapienza» University of Rome. In the survey two different 28-item format responses have been compared: five-point and 0-5 cm. segment. Both sets of data have been analysed and compared by Principal Component Analysis. The factorial structure resulting suggests that the components are not clearly separated; therefore a different composite indicator (index) is suggested, instead of the classic indexes based on the single factor solutions. The new index shows the multidimensionality of the phenomenon, has different requisites, a simplified measurement and interpretation, and reliability coefficient theta is 100%.