Purpose: Designed as a supplemental scoring form for the house-tree-person technique.
Population: Children and adults.
Score: IQ score.
Time: Not reported.
Author: John N. Buck.
Publisher: Western Psychological Services.
Description: The House-Tree-Person (H-T-P) projective technique developed by John Buck was originally an outgrowth of the Goodenough scale utilized to assess intellectual functioning. Buck felt artistic creativity represented a stream of personality characteristics that flowed onto graphic art. He believed that through drawings, subjects objectified unconscious difficulties by sketching the inner image of primary process. Since it was assumed that the content and quality of the H-T-P was not attributable to the stimulus itself, he believed it had to be rooted in the individualís basic personality. Since the H-T-P was an outcropping of an intelligence test, Buck developed a quantitative scoring system to appraise gross classification levels of intelligence along with at qualitative interpretive analysis to appraise global personality characteristics.
Scoring: The Post-Drawing Interrogation form (PDI) consists of 60 questions varying from direct and concrete to indirect and abstract. Once the PDI has been administered and the interview has been completed, the examiner records items of detail, proportion, and perspective in the Scoring Folder. After completing the scoring tables, the examiner derives an IQ figure for the percentage of raw G, a net weighted score, a weighted "good" score, and a weighted "flaw" sore, which then comprise the items for the profile configuration.
Reliability and Validity: The manual contains no information on validity and reliability.
Norms: The standardization sample included 140 adults. No attempt was made to randomly select a stratified sample of subjects from the general population. Twenty adults were selected for each of seven intellectual levels (imbecile, moron, borderline, dull average, average, above average, and superior).
Suggested Uses: This instrument is recommended for projective assessment in research and clinical settings.