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The growing demand for UI test automation has triggered the development of many tools. Researchers and developers have been continuously working to further improvise the existing approaches. If we look at GUI test evolution we can observe a clear progress from manual testing towards complete automation. Numerous approaches have been made to automate the GUI testing process. Record and playback tools, key-word driven methodologies, event flow exploration strategies, model based approaches are continuously evolving with higher level of automation. Similarly, new ideas and strategies to make these tests efficient are also emerging. Optimization of this resource consuming activity is another very important aspect in this area.  Dependencies between different tests can create deadlock scenarios, while running larger test suites. A concept of Ordered Test Suite can be used to cope with such dependencies. Following the Model Driven Architecture initiative by Object Management Group, a new global trend of Model Driven Engineering is creating a big sensation in the field of model based software development. Using the same principle, studies have also been made to automatically generate tests from models. Behavioral models can be made using the model driven approaches and these models can be analyzed to generate tests automatically. This master thesis addresses different approaches made for Graphical User Interface test automation, some optimization issues and solutions, a case study done at a software company to automate User Interface testing and a model driven approach for automatic test case generation.