The most widely used measure of social anxiety in clinical research. Assesses fear and avoidance across 24 social and performance situations. Primary outcome measure in most social anxiety disorder RCTs. Self-report version (LSAS-SR) freely available.
Fresco, D.M., Coles, M.E., Heimberg, R.G., Liebowitz, M.R., Hami, S., Stein, M.B., & Goetz, D. (2001). The Liebowitz Social Anxiety Scale: A comparison of the psychometric properties of self-report and clinician-administered formats. Psychological Medicine, 31(6), 1025–1035.
Free access to 2023+ psychometric scales at PsychScales