This study designed a 40-item social capital scale (SCS) and explored its reliability and factorial validity by administering it to one thousand three hundred and fifty two grade three high school students in Mashhad, Iran. The internal consistency analysis and application of the Principal Axis Factoring to the data and rotating the extracted factors via Varimax with Kaiser Normalization showed that the SCS is a highly reliable scale which consists of ten factors, i.e., Self Volunteering, Receptive Relatives, Maternal Supervision, Parental Monitoring, Teacher Consultation, Parental Expectation, Parental Rapport, Family Religiosity, Helpful Others, and Parent Availability. Further analysis of factors revealed that they were reliable and correlated significantly with the SCS and each other. The implications of the findings are discussed and suggestions are made for future research.

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