Documentation for JIRA 6.3 EAP developer (EAP) releases only. Not using this? See below:
(JIRA 6.2.x documentation | JIRA OnDemand documentation | earlier versions of JIRA)

Title: Migrating User Groups to Project Roles  
Author: admin Apr 17, 2009
Last Changed by: Christine Burwinkle [Atlassian Technical Writer] Nov 12, 2012
Tiny Link: (useful for email) https://confluence.atlassian.com/x/_QESCw
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Incoming Links
JIRA 6.3 EAP (2)
    Page: Managing Project Permissions
    Page: Creating a Notification Scheme
Hierarchy
Parent Page
    Page: User and Group Management
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Outgoing Links
JIRA 6.3 EAP (6)     Page: Backing Up Data
    Page: Managing Project Roles
    Page: Managing Groups
    Page: Migrating User Groups to Project Roles
    Page: Using Keyboard Shortcuts
    Page: Managing Global Permissions