Our objective was to compare individuals' ability to intentionally make a positive impression when responding to a Five-Factor Model personality measure under adjective vs. statement and forced choice vs. Likert conditions. Participants were 1,798 high school students who were randomly assigned to either a condition receiving normal instructions or instructions to make a positive impression. We compared the groups' scores and validity estimates under the various conditions. Although impression management occurred on all item types, participants could more easily manipulate their responses to Likert items vs. forced choice items, and statements vs. adjectives. Item type made little difference in terms of convergent and discriminant validity and criterion-related validity for all outcomes but one, ACT scores, which suggests cognitive ability plays a role in impression management ability.