The inclusion criteria are: (a) Proficiency in a Scandinavian language. Participants must state that they have satisfactory skills to participate in group discussions, and answer questionnaires in Norwegian; (b) Age 16 to 69 years. The age range is set to include adults of the age of consent for participation in health research. The upper age limit was set to prevent measurements from being affected by age-related factors; (c) Access to a computer (or smartphone) with internet connection - but note that we can lend a computer to participants who may require this; (d) Genetically confirmed SCA. Participants provide medical confirmation of diagnosis, unless participants are recruited via Frambu (where medical confirmation is available in the user registry for KS 47,XXY karyotype; Jacobs 47,XYY karyotype; Triple X, 47,XXX karyotype; and Turner 45,X karyotype).

There are no explicit exclusion criteria. Ongoing assessments are made during eligibility screening and when conducting training program regarding appropriateness of the training program, both individually and in groups. If the group leader becomes aware of information that indicates the need for specialist health services (e.g., indication of severe mental illness or acute suicidality), this is handled on a case-by-case basis, and the person concerned is then put in contact with the appropriate health care services.

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