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1) ≥ 18 years.
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2) Able to speak, read, and write Dutch.
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3) Able to use a computer and have access to Internet.
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4) CFS diagnosis according to the CDC consensus criteria:
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[1, 2]
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5) Severe fatigue is assessed with the subscale fatigue severity of the Checklist Individual Strength (CIS). Severe fatigue is operationalized as scoring ≥ 35.
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[23]
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6) Disabilities; Disability is assessed with the total score of the Sickness Impact Profile (SIP8). Severe disability is operationalized as a total score ≥ 700 on the SIP8.
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[27, 41]
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7) Given written informed consent.
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Exclusion criteria
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1) Engaged in a legal procedure concerning disability-related financial benefits.
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2) Participating in other CFS research.
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