Well in one sense that is the difference  Anyone who looks at any of the Snellen charts even the one used for illiterates can agree on what the chart saysthe same is not true of the Rorschach test  A Star trek fan like my self might say Klingon battleship for card VI for example now just how do you score that  Furthermore as Robert F Joseph M Maslings  Scoring the Rorschach Seven Validated Systems shows there is more than one way the Rorschach cards are used including methods dating back to the s despite Lee Cronbach stating in  The test has repeatedly failed as a prediction of practical criteria There is nothing in the literature to encourage reliance on Rorschach interpretations  Ie some Rorschach systems still used in  are invalid per standards given  years ago