The purpose of this study is to determine whether an integrated protocol based on cognitive behavioural therapy, positive psychology and third generation therapies is effective in improve the subjective well-being of people affected by a severe mental illness (SMI). The design of the study is a cluster randomized control trial with two arms. Experimental groups will receive 15 sessions to enhance positive emotions, optimism, adaptive coping, finding a purpose in life and sharing it with people who are important to the user. The control group will remain on a waitlist with their treatment as usual (TAU). After the control period (15 weeks), participants of the experimental groups have the chance to receive the intervention. Both groups will be measure before and after de 15 intervention weeks. Additionally, follow-up measures of the experimental group will be taken after 3 and 6 months.
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Satisfaction with life scale (SWLS)
Timeframe: This test is applied before starting the intervention protocol, immediately after the end of the 15-week intervention protocol, and at 3 and 6 months after the end of the intervention protocol.
Psychological Well-being Scale (SPWB)
Timeframe: This test is applied before starting the intervention protocol, immediately after the end of the 15-week intervention protocol, and at 3 and 6 months after the end of the intervention protocol.