Four studies were conducted to assess the psychometric properties and the theoretical basis of a version of the Inventory of Desirable Responding in Relationships, which was originally developed and validated for the assessment of romantic relationships, in a different relational context (i.e., coach-athlete relationships). The first study aimed to address the content validity of the modified inventory, the Inventory of Desirable Responding in Coach-Athlete Relationship (IDR-CART) scale. The second study employed factor analytic techniques to examine its psychometric properties. Results confirmed the two-factor structure of the inventory: self-deception (CART-SD) and impression management (CART-IM). In the third study, data were collected under public and anonymous conditions. Results revealed, however, that neither condition supported the factor structure, thereby casting doubt on theoretical assumptions. The fourth study demonstrated that CART-SD is associated with indices of relationship quality, providing evidence of convergent validity. Limitations and future research directions are discussed.