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Quality and usability of Web applications are considered to be key aspects of their success. If these aspects are not adequately represented in a Web application, or if they are not appropriately combined, there will be little to prevent the users from browsing further in search of an application that will more effectively satisfy their needs. However, the main challenge is to identify key attributes that will retain users on a Web application longer or influence their decision to visit it again. There are many frameworks and methodologies that deal with this issue but very few of them have an emphasis on assessing the quality and usability of Web 2.0 applications. This paper contains a critical review of previous research in the field of Web quality assessment. It provides the theoretical basis for the development of a set of attributes that should be considered when measuring the quality of Web 2.0 applications.