The aim of this thesis has been to investigate the notion of single page web- sites through quantitative and qualitative research, in order to establish a framework of design principles. Through the phenomenological approach, the process has involved continuously acquiring new knowledge about the phenomenon, and plan the process accordingly. In order to investigate the phenomenon, we have looked into its context and how technology has influenced the dissemination of other website genres, which involved investigating the history and evolution of the World Wide Web. Furthermore, in order to establish what constitutes a single page website, we looked into the structure and features used in the anatomy of single pages. Additionally, we conducted a quantitative investigation by categorising 100 single page websites aimed at getting insights into the current context and how the information architecture structures are designed and utilised. This led us to suggest a genre division, which involves the two sub-genres Avantgarde and Conventional. On the basis of this preliminary research, we conducted a usability study of a qualitative and quantitative nature, involving 17 participants. This study focusing on the usability and user experience of single pages involved examining a website from each sub-genre, hereby building on the preliminary research. The data from this usability study was transcribed and analysed, thus creating the foundation for establishing a framework of design principles taking into account how users perceive and interact with single page websites.