The Scale for Interpersonal Behaviour and the Wolpe-Lazarus Assertiveness Scale: a correlational comparison in a non-clinical sample

Despite an explosive proliferation af assertion measures, a hiatus has been observed by several authors to establish the psychometric adequacy of existing intstruments. In order to expand the construct validity of the Scale for Interpersonal Behaviour (SIB) further, its (sub)scale components of distress and difficulty in assertiveness were correlated with the Wolpe- Lazarus Assertiveness Scale, the Social Anxiety Scale (a trait meassure), and background factors such as sex, age and military rank in a large sample of healthy military personnel. From the findings it emerged that the measures exhibit a sizeable degree of shared variance (being only very minimally affected by item overlap across intstruments), and that SIB scores are not affected by sex and age, though minimally so by military ran