The investigation factor structure of the Farsi form of

The "Social Phobia Inventory" (SPIN) is a well-known screening tool in the field of social phobia disorder (social anxiety disorder) that its creators have designed its items in independent three subscales fear, avoidance, and physiological signs and several international studies and also a few internal studies have been done using it. The weakness of existing studies have motivated these authors to investigate this inventory in a nonclinical Iranian sample. Because of this, 475 students of Tehran University were selected using convenience sampling and completed SPIN. In order to analyze data, data were analyzed with Cross Validation method and Exploratory Factor Analysis (EFA), Parallel Analysis and Confirmatory Factor Analysis (CFA). The results of EFA and Parallel Analysis indicated 2 factors structure of SPIN and the results of CFA indicated the fitness of 2 and 5 factors structure with data. In conclusion, the results of this research suggest the regardless of the separation of items related to subscales fear, avoidance and physiological signs, the items related to fear and avoidances of different areas apply together for assessing severity of this disorder; the phenomenon that is according to social anxiety and united relationship of fear and avoidance.