Another invaluable tool for testing purposes is the crash and debug log files generated by your testing platforms. You can learn a tremendous amount of information from a crash log, including the environmental conditions on the device platform when the crash occurred, memory usage of the app, and which library was causing the app to be terminated.

Whenever a crash occurs on an iOS device, the OS will generate a crash log that is then stored to the disk. If your device is synced with iTunes, the log will also be stored on your development machine. Alternatively, you can connect to the device through Instruments and review the crash logs using the diagnostic tools. Viewing the crash logs in Instruments tends to provide a raw picture of what is happening because you will see all of the stack trace information that can be a little difficult to sift through. Often, it's this additional information that gives you the clue you need to pinpoint the source of the problem. If you are looking for...