With new wireless technology constantly being developed, Web-Based DSS (W-DSS) in online shopping is increasingly common nowadays. People can search for and buy products online much more conveniently and efficiently than shopping in retail stores.However, there are lacks of information provided by the online stores which can drive the customers to W-DSS. Hence, the customers are not attracted to W-DSS for online shopping whereby they are more kin to traditional shopping. This book aimed to identify the critical factors that influence W-DSS success model in the field of online shopping. A model is proposed to measure how W-DSS support online shoppers focused on Business to Customer (B2C) shopping mode. This ensures on how online shoppers make effective decision making before purchasing online. The users' intentions are based on three aspects which are interface quality, data quality, and knowledge management. For interface quality the attributes are: ease of use, flexibility, and integration. The data quality attributes are accuracy, comprehensiveness, and completeness. Lastly, the knowledge management attributes are: problem solving, decision making, and learning and teaching.