Signals and Telecommunication Journal Najam us Saqib, Sara Shahzad 7 2 2018 https://doi.org/10.6025/stj/2018/7/2/52-62 http://www.dline.info/stj/fulltext/v7n2/stjv7n2_2.pdf Mobile applications have proliferated internet market due to abundant development of smart mobile phones and mobile devices. Testing of these mobile applications is crucial before they are made available to the customers. Testing mobile applications has remained a big challenge for software professionals because of diverse features of mobile phones as well as limitations which come with small size and portability. In this context testing of the application’s GUI is of utmost importance. GUI is tested for for efficiency, reliability and user friendliness. A number of testing models and techniques have been proposed to automate GUI testing to reduce testing time, but still there is no technique which can be considered as standard. This paper presents an analysis of available GUI testing techniques to expose their limitations and critical issues related with GUI testing automation, cross platform testing, GUI modeling, and automatic test cases generation and execution. To handle these issues TriTest, a model based approach is proposed which aims to automatically test functionality, compatibility, and performance of mobile apps.