Additional goals are ( 1 ) to examine if psychological flexibility , self-compassion , mastery , supportive behavior , posttraumatic growth and resilience are mediators of the intervention 's effects on the partners ' mental health ; ( 2 ) to examine the moderating effects of the socio demographics ( age , gender , education , working situation , family situation ) and disease-related characteristics of the patients ( sort of cancer , stage of disease , duration and treatment of cancer ) ; and ( 3 ) to investigate to what extend participants are satisfied with the intervention , which parts of the intervention are mostly used , and how adherent the users are .