The present study presents the development and validation of the Social Interaction and Performance Anxiety and Avoidance Scale (SIPAAS), a self-report questionnaire to assess the level of distress and avoidance in a wide range of performance and social interaction situations, and the Social Phobia Safety Behaviours Scale (SPSBS), a self-report questionnaire designed to evaluate in-situation safety behaviours in which social phobics engage to try to prevent social catastrophe. The psychometric adequacy of both scales was evaluated in three different samples: social phobic patients, other anxiety disordered patients, and normal population. Both scales were normally distributed and were shown to possess high levels of internal consistency and temporal stability. They reliably discriminate patients with generalized social phobia from patients with non-generalized social phobia, other anxiety disordered patients, and normal population. Both subscales of the SIPAAS have shown high correlations with other measures of social anxiety (SAD, FNE), whereas the SPSBS has shown low to moderate correlations with SAD and FNE. It appears that these new self-report scales are reliable, valid and useful measures of social phobia for clinical and research purposes.