This thesis lies within the field of Information Systems and Human-Computer Interaction with a particular focus on user acceptance of tickets in relation with football games. The goal of this thesis is to study user acceptance of paper and electronic tickets and to study the electronic ticket in relation with the Innovation of Diffusion theory (IDT) by Rogers (Rogers, 2003) and Ubiquitous computing and related theories. The technology emphasized is the wireless technology RFID and especially contactless smart cards which are used as the electronic ticket. A case study is conducted on the Smart Stadium system which is used at different football stadiums in Norway. Kristiansand stadium is one of these and it is reviewed closely. One of the benefits with the Smart Stadium system is the use of electronic tickets. A user survey is conducted among 156 users of the system as well and this shows that the paper ticket has higher user acceptance than the electronic ticket. Tradition and the feeling of security when holding the paper ticket physically in the hand are the mains reasons for this choice. The categorization of the respondents from the survey into adopter categories shows slight differences from the original model developed by Rogers. In addition can concepts from Ubiquitous computing and related theories like Calm computing, Tangible computing, Ambient Intelligence and Unremarkable computing make the attribute of complexity, which is one of Rogers five perceived attributes of accepting technology, better described and understood.