This pilot exploratory randomized controlled trial will evaluate the feasibility, acceptability, and safety of a personalized online occupational therapy intervention for adults with scleroderma in Spain. Participants will be individually randomized in a 1:1 ratio to either an online occupational therapy intervention added to usual care or usual care alone. The intervention consists of eight individual online occupational therapy sessions delivered over four weeks, with two sessions per week, plus individualized materials. The control group will continue with usual care during the intervention and follow-up period. Outcomes will be assessed at baseline, post-intervention, and four weeks after the end of the intervention. The primary outcome is feasibility, defined as the proportion of participants in the intervention group who complete at least six of the eight planned sessions. Secondary and exploratory outcomes include acceptability, adherence, safety, technical feasibility, functioning, quality of life, occupational balance, hand function, and individual goal attainment.

Scleroderma is a chronic connective tissue disease that may be associated with skin and visceral fibrosis, pain, fatigue, stiffness, respiratory symptoms, gastrointestinal symptoms, vascular alterations, and functional limitations. From an occupational perspective, these manifestations may affect activities of daily living, self-care, work, leisure, social participation, quality of life, hand function, and occupational balance.

This study is based on a previous cohort of adults with scleroderma in Spain, in which information was collected on functioning, quality of life, occupational balance, hand function, symptoms, assistive products, and unmet needs. The present phase aims to implement and preliminarily evaluate a personalized, occupation-centered, online occupational therapy intervention.

The study is a pilot exploratory parallel-group randomized controlled trial with individual allocation in a 1:1 ratio. It is coordinated by the University of Zaragoza and delivered remotely. Participants take part from their home or community environment in Spain. The intervention group receives eight individual online occupational therapy sessions, approximately 50-60 minutes each, twice weekly over four weeks, through Google Meet and without recording. The intervention is individualized according to baseline assessment and the first session, including personalized occupational goals using SMART criteria and Goal Attainment Scaling. The control group continues with usual care and does not receive additional intervention from the research team during the intervention and follow-up period. After completing follow-up, the control group will receive access to general educational materials and will be offered an online educational group session.

The primary feasibility outcome is the proportion of intervention-group participants who complete at least six of the eight planned sessions at post-intervention assessment. The pre-specified feasibility threshold is at least 70%. Secondary outcomes include acceptability, adherence, safety, and technical feasibility. Exploratory clinical and occupational outcomes include WHODAS 2.0, WHOQOL-BREF, Occupational Balance Questionnaire, Cochin Hand Function Scale, and Goal Attainment Scaling in the intervention group.

Inclusion Criteria:

• Adults aged 18 years or older with scleroderma from the previous project cohort and meeting the general eligibility criteria of the initial study.
• Current residence in Spain.
• Sufficient Spanish language ability to provide informed consent, participate in the intervention, and complete study assessments.
• Ability to understand the study information and provide informed consent, with support if needed.
• Access to the internet and to a device compatible with Google Meet and Hefora.
• Availability to participate in eight online sessions of approximately 60 minutes, twice weekly over four weeks.
• Not currently participating in a specific occupational therapy program or another intervention that could substantially influence functioning, activities of daily living, quality of life, or occupational balance.
• Provision of informed consent and completion of the baseline assessment.

Exclusion Criteria:

• Clinical condition or severe comorbidity preventing safe participation.
• Current residence outside Spain.
• Inability to provide informed consent or complete the baseline assessment.
• Concurrent participation in a specific occupational therapy program or another intensive, potentially interfering rehabilitation or therapeutic education intervention.
• Withdrawal of interest before the effective start of the intervention or inability to participate during the planned study dates.

Individual participant data will not be publicly shared due to the small sample size, the low prevalence of systemic sclerosis, and the potential risk of re-identification from the combination of sociodemographic, clinical, and occupational variables. Study findings will be disseminated only in aggregate form. General intervention materials and statistical code may be shared after review to remove any potentially identifiable information, but no individual participant-level dataset will be deposited in a public repository.

Participants and the occupational therapist cannot be masked because of the nature of the intervention. The principal investigator generated, stored, and communicated the allocation sequence and is therefore not masked. The outcomes assessor/statistical analyst will work with the group variable coded and will remain masked to the meaning of the codes until the planned final analysis stage, unless unmasking is required for safety reasons.