In the first part of this thesis, a comparison of the Selenium IDE and Selenium WebDriver automation tools (Java and C#) for different types of web applications is presented, in order to show the benefits of automated testing when each of the tools is used in different types of web applications. Next, a classification of the web applications is made according to the testing levels, giving, as a result, the separation of the applications in three groups: small, medium and large application. Finally, through the proposed methodology for the automation of the tests, the suitable automation tool can be selected according to the knowledge achieved by the tester and the type of application to be tested.