Abstract: E-commerce is a process of buying, selling, transferring or exchanging products or services using computer network. Small businesses are now encouraged to explore the use of e-commerce in order to expand their market. However, studies shows that the use of e-commerce among small businesses is still in the early stage. The main barrier to the e-commerce adoption amongst these businesses is the complexity and cost of e-commerce development. In order to solve the problem, there is a need to develop a software tool that can help small businesses to develop their own e-commerce application. This study describes the concept of a block-based e-commerce development tool. By using this approach, an end-user can develop an application by integrating available software blocks. In order for these software tool to be utilized, sufficient number of software blocks need to be identified and developed. The block identification process is done by using the use case analysis technique. From the result of the analysis, 16 software blocks needed for the development of e-commerce applications have been identified. These blocks are then implemented by using the Java programming language.