Family Triad Systemic Scale: An Instrument for Assessment of Relationships between Couple and Families of Origin

Because of noticeable role of relationships with in-laws in prediction of marital adjustment and satisfaction in Iran, it is necessary to provide an instrument based on Family Triad Systemic Model (FTSM) to assess the relationships between couple and two original families. The objective of present study was providing the instrument and checking the psychometric properties of it. An item pool (107 items) was created by using other related tools, interviews by experts and married people. Then 425 participants selected through accessible sampling method conducted the questionnaire. By Principal Component Analysis and Varimax rotation three factors (we-ness, boundaries, joining in-laws) were extracted supporting the FTSM. Three factor model could explain 47.27% of total variance. Face validity of instrument was examined by eight experts. The Intraclass Correlation Coefficients for we-ness, boundaries and joining the in-laws were: 0.84, 0.81, 0.86 (p