Implementation of the Waterfall Model in the Design and Development of a Web-Based Cashier Information System

Abstract

This research aims to design and develop a web-based cashier information system using the Waterfall software development model. The system is designed to support sales transaction processes, product data management, and financial reporting more effectively and efficiently. Problems commonly found in conventional cashier systems, such as transaction recording errors, delays in data recap, and difficulties in accessing information, form the background of this development. The Waterfall method was chosen because it provides systematic and structured stages, including requirements analysis, system design, implementation, testing, and maintenance. In the analysis stage, user needs were identified through observation and interviews. The design stage employed UML diagrams such as use case diagrams, activity diagrams, and class diagrams to illustrate the system flow. The system was implemented using PHP programming language and MySQL database, while testing was carried out using the black box testing method to ensure all functions operated according to requirements. The results of the study show that this web-based cashier information system can process sales transactions quickly, reduce data input errors, and facilitate stock management and report generation. Thus, the application of the Waterfall model has proven effective in developing a measurable, maintainable system that meets user needs in small and medium-sized enterprises.