You are asking some very basic questions here that strongly suggest that you have not used JIRA or read any of the documentation, and you are repeating them.
I'd recommend that you contact an Atlassian Solution Partner and get some basic training in, or contact your administrators and ask for their help.
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As part of the Bitbucket product team I'm always interested in better understanding what kind of impact the use of our tools have on the way you work. In a recent study we conducted of software devel...
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