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IntroductionA cancer diagnosis and subsequent treatment can be disruptive and traumatic, often accompanied by a multitude of stressors for the cancer patients and their support network [1][2][3]. Uncertainty of outcome and medical procedures with aversive side effects are not uncommon, and while people differ widely in how they experience and cope with such challenges, cancer related distress including worry, anxiety and depression, as well as reduced quality of life (QoL) are prevalent [2,4,5]. Fortunately cancer survival rates are improving, but survivorship is accompanied by long-term health challenges and many survivors struggle to cope and maintain a positive quality of life [6,7].Psychosocial cognitive behavioral stress management interventions are well documented, structured and multidisciplinary, focusing on specific strategies to improve physical, social, emotional, functional, and overall well-being [4,[8][9][10][11][12][13].Addressed are often factors such as educational information, coping, relaxation-and mindfulness training, problem solving skills, self-care strategies, thought awareness and mood management, health behavior change, social support and communication strategies. These interventions have been shown to facilitate psychological adaptation to cancer, including reducing distress, anxiety, negative affect and depression, as well as improving QoL [4, 8-10, 12, 13]. Positive findings are also supported by reviews and meta-analyses [14][15][16][17][18][19][20]. Some of these interventions have even been shown to have beneficial effects on immune markers [9,21, 22], and there are indications that recurrence and survival rates may also be positively affected [20,23].2 Unfortunately, face-to-face psychosocial interventions are not always offered or easily available to the cancer survivor. In addition, patients with cancer face many demands and stressors, often feel overwhelmed, and may be reluctant to take on the additional commitment of attending and engaging in psychosocial intervention programs [13]. If psychosocial interventions are unavailable, or attending in-person services appears too challenging despite unmet needs, innovative thinking is needed about how psychosocial challenges can be addressed and coping skills supported in a format that is appealing and available to cancer survivors.With the rapid advance of technology, the evolving concept of eHealth encompasses a range of systems or services in a novel cross-section between medicine, healthcare and information technology. eHealth solutions carry the potential to provide support anytime and anywhere, which again can facilitate ways The current study reports on the design and development of a technology based stress management intervention for cancer survivors. The study combined wellestablished cognitive behavioral stress management concepts shown to be effective for patients with cancer in face to face interventions [4, 8-10, 12, 13, 31, 32] with a user-centered design approach to ensure that the intervention was designed in line ...