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or more social situations in which the person is exposed to possible scrutiny by others and fears that he or she may do something or act in a way that will be humiliating or embarrassing (APA, 2000). Studies on the course and treatment of social phobia in Spanish children and adolescents are few (Rosa, Olivares, & Iniesta, 2009). One reason may be that there are few assessment and diagnostic instruments for the young Spanish-speaking population. However, there are a number of instruments to assess social phobia in other cultures. One of these that has been tested empirically is the Liebowitz Social Anxiety Scale for Children and Adolescents (LSAS-CA-SR; Masia-Warner et al., 2003). The LSAS-CA-SR has an interview format and it includes situations which are modifications of the adult version (LSAS; Liebowitz, 1987). It contains 24 items: 12 items are social interaction situations, and the other 12 are performance situations. Each item assesses the fear level and the avoidance level on a Likert type scale: Clinician ratings of anxiety (0= none, 1= mild, 2= moderate, 3= severe) and avoidance (0= never, 1= occasionally, 2= often, 3= usually). It provides seven scores: (1) anxiety related to social interaction, (2) performance anxiety, (3) total anxiety, (4) avoidance of social interaction, (5) avoidance of performance situations, (6) total avoidance, and (7) a total score. Masia-Warner et al. (2003) and Storch et al. (2006) evaluated the psychometric properties of the LSAS-CA-SR in a clinicianadministered format. They found that is a reliable and valid instrument for assessing social phobia in youngsters. The scores showed excellent internal consistency for the total score as well as for the specific subscale scores. No results on factor analysis were found by the authors. However an appropriate structure for instruments of fear and avoidance has been found, with excellent psychometric properties in self-report format for Spanish children and adolescents (Olivares, Sánchez-García, Rosa, & Piqueras, 2004). This report presents the factorial structure, reliability and validity in the same population using a self-report version of LSAS-CA-SR.