We investigated the impact of administration and inquiry skills on Rorschach Comprehensive System (CS; Exner, 1974 Exner, J. E. 1974. The Rorschach: A Comprehensive System, New York: Wiley. [Google Scholar] , 1991 Exner, J. E. 1991. The Rorschach: A Comprehensive System: Vol. 2. Interpretations, , 2nd ed., New York: Wiley. [Google Scholar] , 1993 Exner, J. E. 1993. The Rorschach: A Comprehensive System: Vol. 1. Basic foundations, , 3rd ed., New York: Wiley. [Google Scholar] ) protocols collected for the Italian adult nonpatient reference sample. The same research team collected CS protocols on two occasions. The initial reference sample (N = 212; Lis, Rossi, & Priha, 1998) was collected under the supervision of experienced psychologists who carefully studied CS administration and scoring procedures ( Exner, 1986 Exner, J. E. 1986. The Rorschach: A Comprehensive System: Vol. 1. Basic foundations, , 2nd ed., New York: Wiley. [Google Scholar] , 1990 Exner, J. E. 1990. A Rorschach workbook for the Comprehensive System, , 3rd ed., Asheville, NC: Rorschach Workshops. [Google Scholar] , 1993 Exner, J. E. 1993. The Rorschach: A Comprehensive System: Vol. 1. Basic foundations, , 3rd ed., New York: Wiley. [Google Scholar] ). The second sample (N = 101; Lis, Zennaro, Calvo, & Salcuni, 2001) was collected after the team obtained additional and sustained CS training from Rorschach workshops certified instructors. Both samples were scored, reliably but they showed large differences on many codes, with protocols from the second sample being richer and more complex than the first. The results indicate that administration skills can have a dramatic impact on CS protocols and may contribute to variations in samples collected by different investigators. Training standards should be devised to insure uniform administration procedures are followed when collecting CS protocols.