JIRA is a development management tool used by VIVO and Vitro. See http://jira.duraspacelyrasis.org for collections of issues pertaining to VIVO and other Duraspace LYRASIS projects.
There are many JIRA resources on-line – resources from Atlassian, the makers of JIRA, and others from development teams around the world that use JIRA.
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The best way to learn about JIRA is to explore. If you have a Duraspace LYRASIS account, visit http://jira.duraspacelyrasis.org If you do not have a Duraspace LYRASIS account, you can get one by sending email to sysadmin@duraspacewikihelp@lyrasis.org