Multiple-item assesses are emphasized in this application because they are more probable to be legitimate than single-item measures. Although one good inquiry or fact may be sufficient and 30 awful ones are ineffective, there are causes why multiple-item assesses are more probable to be valid. One cause is that most phenomena of concern to family investigators have multiple facets that can be amply comprised only by use of multiple items. A lone inquiry, for demonstration, is improbable to comprise the multiple facets of marital approval adequately. ...