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The "depth interview" is defined in terms of social-psychological types of information conceived as "dimensions" of depth: (1) ego-threat, (2) fogetting, (3) consciousness of original experience, (4) generalization, (5) subjectivity, (6) trauma, (7) etiquette, and (8) chronology. Awareness of these types of problems may guide the interviewer in solving practical problems of interviewing and aid research by focusing attention on certain social-psychological barriers to free communication.
Raymond L. Gorden (Sat,) studied this question.