Title: Achieving behavior change in physical activity level for the participants of the COPD rehabilitation course at Sundhedscenter Aalborg through the usage of an SMART-device and the appertaining social media. Problem: Citizens with chronic obstructive pulmonary disease (COPD) can slow disease progression by means of physical activity. Rehabilitation courses for people with COPD, where physical activity is included, has a short term effect, but there is a tendency for the participants to not maintain the physical activity after the course is completed. Hence there is an issue related to maintaining people with COPD in their potential behavior change in relation to being physically active after rehabilitation. As a mean to motivate participants to physical activity Sundhedscenter Aalborg introduces pedometres in their COPD rehabilitation course. However, there is a tendency that this effect, by only using pedometres, decreases over time. There is a potential that SMART devices and social media are tools that can sustain this behavior change in physical activity. Therefore, it is interesting to examine how the COPD rehabilitation course at Sundhedscenter Aalborg can benefit from SMART devices and the appertaining social media. Aim: The aim is to investigate how lasting changes in physical activity can be achieved through the use of SMART devices and the appertaining social media for participants of the COPD rehabilitation course at Sundhedscenter Aalborg. Furthermore, it was examined how the rehabilitation course can be changed so that SMART devices and the appertaining social media can be implemented in the rehabilitation course. Method: Six focus group interviews were conducted with the participants of the COPD rehabilitation course at Sundhedscenter Aalborg. Furthermore, a systematic literature search was carried out. Based on the focus group interviews and the systematic literature search, with the addition of Bandura's selfefficacy and Davis' Technology Acceptance Model, the aim is to discuss how SMART devices and the appertaining social media can be used to create lasting changes in physical activity. Results: Five code groups were identified from the focus group interviews 'Functions of the pedometer', 'Experience of the pedometer, 'The social aspect', 'Introduction' and 'Experience of and attitudes towards technology'. The systematic literature search resulted in four studies; a qualitative study, a mixed-method study and two review articles. Conclusion: In conclusion the SMART device Garmin Vivofit 1 may affect the participants’ self-efficacy. A SMART device and a social media is not limited by the duration of the rehabilitation course and for this reason they continue to affect participants' self-efficacy, and thus provide an opportunity to create lasting behavior changes in physical activity. This continued affect of the SMART device requires that participants accept and acquire a SMART device - the probability of participants accepting a SMART device can be increased through the SMART device and social media introduction during the rehabilitation course. Whether the change may actually result in lasting changes in behavior can not be definitively concluded before the change is implemented and then evaluated.