Background: Responsible behavior is one of the indicators of a healthy human which its strengthening and growth will not be possible except by identifying the factors affecting responsible behavior. To this end, the present study seeks to answer the question of whether family performance, psychological capital and satisfaction of psychological needs of adolescents have an effect on their level of responsibility and mental vitality or not?
Aims: The present study was conducted with the aim of family performance, psychological capital, psychological needs with mental vitality: the mediating role of adolescents' responsibility during adolescence.
Methods: The present study was descriptive, with correlation and structural equations. The statistical population of this study consisted of all adolescents aged 14 to 18 years in Tehran in 1399. The research sample was 400 adolescents in districts 1 and 2 of Tehran who were selected by multi-stage cluster sampling. Research data was collected using the self-report questionnaire of Kim and Kim family (2007), psychological needs of Lagourdia et al. (2002), McGee (2011), Soroush (2012) and the mental vitality of Kiyez et al. 2003). Data were analyzed using Pearson correlation coefficient and structural equation modeling.
Results: The findings showed that family performance, psychological needs and psychological capital have a direct and indirect positive effect on students' responsibility and mental vitality. The results of structural equation modeling showed that 39% of the variance of responsibility and 48% of the variance of mental vitality are explained by family performance, psychological needs and psychological capital and responsibility.
Conclusion: Recognizing the factors affecting students' responsibility and mental vitality provides the possibility of anticipation and planning to help ensure their mental health. It is also possible to take steps to increase social, emotional and psychological vitality by creating a suitable environment in schools.

Background: The family institution is one of the most central educational environments that plays a significant role in maintaining a person's mental, social, and physical health. One of the important models in the field of examining family functioning is McMaster's family functioning model.
Aims: The present study was conducted with the aim of modeling structural equations for predicting marital conflicts based on family functioning based on the McMaster model (problem solving, communication, roles, companionship, behavior control, emotional intercourse), with the mediation of sexual satisfaction in couples in Shiraz.
Methods: This study was a correlational and structural equation type. The statistical population of the research included conflicting couples in Shiraz city in 2020. Using random sampling method, 300 people were selected from conflicting couples. The participants completed questionnaires of marital conflicts (Sanaei Zaker, 2017), family assessment (Epstein et al., 1983), sexual satisfaction (Hudson, 1981). To analyze the findings, the method of structural equations and Pearson's correlation coefficient and regression were used using SPSS-25 and AMOS-24 software.
Results: The results showed that the proposed structural model had a good fit and the predictor and mediator variables have a significant direct and indirect effect on the sexual satisfaction of couples (P<0.05). Also, the results indicated the existence of an inverse relationship between the components of family functioning and marital conflicts.
Conclusion: Based on the findings obtained in this study, it can be said that apart from the influencing factors of family functioning, marital conflicts and sexual satisfaction play an essential role in improving and stabilizing the family system and should be taken into consideration.