A defect tracking system provides a way to organize and keep track of application bugs, called defects, and is generally used along with a process for resolving these defects. Resolving a defect generally means fixing the problem and verifying that the fix is correct in a future build.
With mobile applications, defects come in many forms. Some defects occur on all handsets, while others occur only on specific handsets. Functional defects—that is, features of an application that are not working properly—are only one type of defect. You must look beyond these and test whether an application works well with the rest of the Android operating system in terms of performance, responsiveness, usability, and state management.
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