The Effects of a Parent Guidance Intervention on Communication among Adolescents Who Have Experienced the Sudden Death of a Sibling

Existing and new validity data on 3,880 cases from the Bricklin Perceptual Scales and Perception-of-Relationships Test address the assertion that custody data cannot be generated scientifically. Reliability (93 percent stability over 8 months) and validity data (90 percent agreement with multiple independent criteria) are presented, but without a fully explicated chain linking evidence to conclusions, one ends up with unresolvable, typically all-or-none, disputations about the adequacy of one's evidence. This chain includes, among others, the (confusing) role of values in science and how system complexities affect the choice of measurement units as well as measurement relevance. We also consider the value of information to a specific decision-maker. Psychometric indices, the usual source of such arguments, cannot alone address any of these areas.