Diane is using an app that was developed by her company for internal use. She is running the app on
her MacBook Air (13-inch, Mid 2013). The app quits unexpectedly but never displays any error
messages. The other apps on her machine work without issue and she has reproduced the issue with
the app on another machine. She wants to help her development group isolate the issue. Which of
the following troubleshooting tools or techniques would you advise that she use to best isolate the
If an app crashes on launch and no “unexpectedly quit” message ever appears, go to
/Applications/Utilities and launch Disk Utility. From here, select your startup volume and click on the
First Aid tab. Then click on Repair Disk Permissions.