We have been using Jira at our office for 5-6 years or so. During this time I was a member of the development team and was just an end user of Jira. After the recent change in my position I'm expected to use Jira as a management tool. Default installation of Jira comes with some defaults which will definitely help you but if you want to effectively manage your team and the job you have to fine tune your Jira setup.
Jira 4 Essentials by Patrick Li (Packt Publishing) is a must read book if you need to fine tune and customize your Jira installation to meet your very own needs. The book walks through each customizable bit of Jira and with the Help Desk Project section at the end of each chapter customizations are applied to a practical sample implementation. I highly recommend team managers and Jira admins to read Jira 4 Essentials.

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