News are of central importance for informing the public, and they are increasingly available on the internet. In terms of variety, the economic challenges on the part of the providers and the weight of the users' acceptance it is time to learn more about the readers of online news. How are news sites used? What expectations do the readers have, and how do they perceive different formats of news sites? The objective of this book is to show how quality assessment and usage are related to each other. In order to find out what a good news site is characterised by and what possibly directs the usage behaviour, a measuring instrument for detecting the quality of news sites has been developed and validated empirically. By examinating the explanatory potential of the "Theorie der subjektiven Qualitatsauswahl" in the context of online news, it is possible to identify interfaces between journalism research and audience studies.