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Objectives: Digital interventions are increasingly used to support behaviour change. In the prevention of chronic work-related skin diseases, the sustainable implementation of appropriate skin protection behaviour following tertiary individual prevention is important. However, there exists no intervention to support the maintenance of these behaviour changes until now. We report the systematic development of a technology-based maintenance programme to support patients to sustainably implement skin protection behaviour and to overcome barriers. Design: Complex intervention development based on a five-step multi-methods process. Setting: Tertiary individual prevention of work-related skin disease in Germany. Methods: Intervention development comprised the following steps--literature review, qualitative focus groups with stakeholders, quantitative assessment of the patients' needs, development of a programme theory, and intervention development and concept validation. Results: We developed a concept for a complex intervention based on results from the literature review, with seven reviews meeting the criteria; qualitative focus groups involving three dermatologists, five health educators, two psychologists and three employees of an accident insurance institution; and a quantitative needs assessment with 72 patients. Key requirements were derived from this process: for example, the need to develop an app to self-monitor skin protection behaviour and skin condition and to inform the individual about ways of dealing with barriers encountered during the uptake and maintenance of skin protection behaviour. In addition, patients will participate in an individual goal-setting exercise to identify individual behavioural goals. Conclusion: A technology-based approach to the prevention of work-related skin diseases was developed. During the process of development, the perspectives of relevant stakeholders and the target group were considered in a participatory way.