GREAT Process Modeller is a platform for business process modeling and specifying requirements for information systems focused on supporting the production of the quality software in record times, their later maintenance and progress. The flexibility of the system is favored by the communication perspective of the method, which allows the analyst and participants in interviews to focus on the business activities that provide new information to the organization, removing the details that do not contribute to the later development of the computerized information system. The reduction of the development time is achieved by employing transformation technologies of models that automate part of the system’s design. GREAT Process Modeller has the characteristic of being global in the sense of covering the entire software development process from the analysis and requirement specification phase until obtaining the final code. It is a tool that supports new software solutions and serves to maintain existing systems. GREAT Process Modeller provides support to reengineering projects, given that several requirements can currently be implemented in existing systems, and it is necessary to adapt them so that the satisfy the needs of the environment. Therefore, it is a platform that offers an environment for modeling and specifying the requirements and the flexible development of software applications through automated transformations.