Web-based information systems (WBIS) aim to support e-business using IT, the World Wide Web, and the Internet. This chapter focuses on the Web site part of WBIS and argues why an easy-to-use and interactive Web site is critical to the success of WBIS. A dialogue act modeling approach is presented for capturing and specifying user needs for easy-to-use Web site of WBIS by WBIS analysis; for example, what users want to see on the computer screen and in which way they want to work with the system interactively. It calls such needs communicational requirements, in addition to functional and nonfunctional requirements, and builds a dialogue act model to specify them. The author hopes that development of the Web site of WBIS will be considered not only an issue in WBIS design but also an issue in WBIS analysis in WBIS development.