Mobile devices being available everywhere and support many functionalities they attractrnbusiness areas and customers. With this interest different new technologies are implementedrnto satisfy user needs. Different operating system developers are in a strong competition tornhold major market share by providing best features. As the technology moves forward qualityrnshould be tested. Hence standard benchmark to measure basic feature performance ofrnoperating systems is needed. The results found from the benchmark measurement are used tornidentify weak and strong points of the operating system. This thesis work focuses onrndesigning benchmark that measures performance of mobile operating systems. The mostrncommon mobile operating systems are Symbian, Android, Windows Mobile, and Blackberry.rnMy first task is studying some features of each operating system. The basic features selectedrnto study the internal behaviour of operating systems were power management, memoryrnmanagement and multitasking. The next task is studying how to design the benchmark. In thisrnwork there are two major points: determining metrics to be measured and studying thernprogramming environment that was used to develop the benchmark. The benchmarkrnmeasured performance of the operating systems using metrics. The metrics are time ofrncompletion of the work, battery percent used to complete the work, and memory used duringrnthe work. The benchmark was tested on emulator and on actual mobile devices for eachrnoperating system. Using the results of the metrics measured a conclusion is drawn and thernreason for the weak point of the performance of the operating system is identified. Based onrnthe benchmark result Android, Symbian, Blackberry and Window Mobile operating systemsrnare listed in order of their performance. Mainly the thesis work is used to identify the strongrnand weak points of each mobile operating system. So this work can be a basis foundation forrnchoosing best suited operating system for an area of interest and also used for further featurernimprovement design of operating systems.rnKeywords: Benchmark Application, Metrics, Features Performance, Operating systems.