This work aims at developing a process and tools for the semi-automatic generation of functional test scripts for web based systems. The process and tools depart from use cases and decision tables, in order to produce high quality automated tests as well as to reduce the time spent generating them. The tests specifications are provided by use cases written in semi-structured Portuguese and obeying a well defined structure. By means of a tool, decision tables are manually built from the use case descriptions. Afterwards semantic test cases are automatically generated from these decision tables. Another tool generates executable test scripts from these test cases. The generated test scripts must suit the tool used for automated testing. In this work, the Selenium tool was used for automating test interaction with the browser. The evaluation of the efficacy of the process and tools was performed applying them to a real system and comparing the result with traditional techniques of automated test generation regarding this same system.