Abstract
Building the ETL process is potentially one of the biggest tasks of building a warehouse. In fact, it is complex, time consuming, and consumes most of data warehouse projects implementation efforts, costs, and resources. Nevertheless, the difference on data structures imposes new requirements on the ETL process implementation and maintenance. What makes these tasks even more challenging is the fact that data continue to grow rapidly and business requirements change over time. In this paper, we propose a method that contains Two-ETL phases, one treats the pre-treatment phase and another deals with the actual ETL. Our method consists on determining the correspondence table, modeling new operations using the Business Process Modeling Notation (BPMN) and implementing these operations with Talend Open Source (TOS). In addition, our method allows the design of ETL process in an earlier stage, which enormously facilitates the implementation of this process. Another advantage of our proposal is the use of the BPMN which allows to cover a deficit of communication that often occurs between the design and implementation of business processes.