JIRA official: Jira custom Workflow

Customize workflows suitable for projects JIRA provides a default workflow and a series of problem types, which are ideal for defect tracking and software development. During use, you can adjust the process at any time according to the actual situation to ensure that the process can quickly adapt to changes in the environment.

Visualize Your Workflow Use the graphic workflow designer to quickly create your workflow. This simple graphical tool helps you quickly create or edit workflows.

Control your workflow Precisely control workflows to ensure that the right person can perform the right operations at the right time. Set automatic workflow actions to execute common or custom tasks, such as updating field values and triggering events.

From: http://www.unlimax.com/jira.html