Abstract
The Personality Research Form (PRF) was administered to 21 male patients with a diagnosis of personality disorders. Each S was administered the PRF under three different instructional sets: standard instructions (SI), instructions to respond desirably (DI), and instructions to respond undesirably (UI). In general, means for the standard instructions were quite similar to those obtained under the instructions to respond desirably. Under instructions to respond desirably, only nurturance proved to be significantly higher and impulsivity significantly lower than under the standard instructions. However, under instructions to respond undesirably, 13 of the 15 PRF scales showed significant differences when compared with standard instructions. For the particular population sampled, it would appear that the PRF is relatively free from susceptibility to “faking good” but is susceptible to negative malingering.

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