Beagle; ‘a stimulating quest throughout the hospital’ is a project that focuses on improving the quality of life and the development (physical, emotional and social) of hospitalised adolescents with CF within the Wilhelmina Children’s Hospital. This graduation project is positioned within the Meedoen=groeien! project of the Dutch Rehabilitation Fund, Princess Maxima Centre for Paediatric Oncology, and Delft University of technology. In general, the aim of this graduation project is to improve the quality of patient care by creating healthcare innovations and developing scientific knowledge in which design and technology play a central role. Cystic Fibrosis is an inherited chronic disease that causes slime to thicken. Various organs that use slime (such as the lungs and digestive system) are hindered and not able to function properly resulting in several complications. People with CF are often shorter of breath and quickly exhausted. The ‘Child Development and Exercise Centre’ of the Wilhelmina Children’s Hospital in Utrecht guides and aids the CF patient by providing physiotherapy. ‘CF patients are encouraged to engage in exercise programs’ (van Leeuwen; 2013). Having a proper physical fitness is of great importance in order to benefit from a better (physically and mentally) and longer life. CF patients are less able to remove filth (e.g. dust and bacteria) from their lungs as a result of the though slime (which cannot be coughed up effortlessly). This makes them vulnerable for infections. In case of an (severe) infection, patients need to be hospitalized. Inside the hospital special rules apply to prevent the patient from encountering new infections or transmitting their bacteria to other CF patients via cross infection. The patient is bound to his or her room (contact isolation) for a hospitalization that could take up to 3 weeks, depending on ones treatment. He or she is prohibited to leave the room, except during so called ‘stapuren’ (step hours) two times a day or when the patient wants (and is allowed) to go outside the hospital under guidance of a parent or health care worker. The segregation policy is not perceived as fun by the patients (next to the hospitalization itself); they are bound their room and there is not much to do. CF patients spend most of the time sitting on their bed passively. Physiotherapists would like to improve this situation by, for instance, activating patients in their room or to offer them the ability to exercise together (observe the segregation regulations). (figure I). The sooner the patients’ physical condition improves, the quicker he or she might feel better (physically and mentally) and hopefully is able to return home sooner (depending on other medical treatment as well). Any activity additional to the patients’ current activity level is welcome (favourably, the more active, the better). However ‘Physiotherapy is often experienced as tedious and time consuming amongst CF adolescents and its direct effect is not recognized’ (Pfeffer et al., 2003) Furthermore, out of the user research and meetings with pedagogical staff members appeared that there seemed to be no specific need for peer contact. Nonetheless participants like to do things together with familiar people (e.g. friends or family) or in some cases with unfamiliar people (e.g. other non-CF patients). Also, there is no possibility yet that enables and allows CF patients to (physically) be together safely inside the hospital. Hence the design goal comes into being: ‘Design a product service system that invites hospitalized adolescents (12-16) with Cystic Fybrosis to activate together while being (physically) segregated from each other.' Patients need to be motivated to become physically active. It was envisioned that the design should be an activity which is fun to do and by doing so, would activate the adolescent (without experiencing it as an obligation). It should also remain fun for a longer period. “ The design should ‘invite’ and ‘captivate’ adolescents to become active.” Various factors influence the motivation and ability of CF adolescents to become active. The segregation policy was perceived as an environmental factor that largely limited the freedom and activation space of CF patients. ‘What if the rules of the segregation policy could still be guaranteed but that patients are free to walk through the hospital?’ This challenge lead to the realization of two concepts that dared this policy (pushing its boundaries) in order to offer the patients more freedom, but still at a safe distance from each other with the necessary hygienic precautions. However during verification meetings with medical specialists became apparent that; the policy is strict and people are hazardous for the risk, resulting in that none of the two concepts were allowed to enable CF patients to exercise together in this form. The feedback resulted in a delimited scope and revised vision. The physical activity should take place after one another in the step hours or together with hospitalized non-CF patients. It should preferably be a small object that changes the hospital context into an enriched environment. Beagle is the result of the final design phase. It is a stimulating quest throughout the hospital. Beagle consists out of several Bluetooth beacons; ‘Beagles’ that are spread throughout the hospital. Hospitalized adolescents are able to install an app on their own smartphone after which they can search for the Beagles during their step hours. Once a Beagle is found, the finder can decide what to do with it. Leave it there, hide it on another spot, take it to their own room, put it at a fun place, do something sweet for the next finder etcetera. It is up to them. The design was tested with four young adolescents (11-12) and one older CF adolescent (16). In general can be said that on the short term all participants enjoyed the first time usage of Beagle wherein the young adolescents were motivated to search for Beagles and were thereby motivated to become active. The Older CF adolescent however would like to have a bit more of a challenge. Beagle transformed the participants’ view of the hospital; they were scanning the environment for Beagles or possible hiding places, observing and using the environment differently than they would do normally. Most of the participants liked to do the quest together with their roommate or friend. The older CF participant, however, did not need to have contact with other peers per se. On the short term, the design goal and interaction vision were met for the younger adolescents, for the older (CF) adolescent however Beagle needs to have adjustment.