About Zephyr and Zephyr Essential
Zephyr is a test management solution. It allows improving the quality of your products by creating and managing test cases and monitoring your testing process.
Zephyr Essential (formerly known as Zephyr Squad, Zephyr for Jira) enables you to manage your testing efforts directly from Jira: you can create 
Test items in your Jira project, link them to other Jira items, group tests in cycles, assign them to release versions, and monitor the testing process.
You can learn more about Zephyr at:
Using Zephyr Essential With TestComplete
TestComplete integrates with Zephyr Essential and enables you to:
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Assign your TestComplete tests as automations to your tests in Jira.
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View your TestComplete test results in Jira and track your testing process across test cycles and release versions.
Try Zephyr Essential Free
If you are interested in trying Zephyr Essential, sign up for a free trial from the Atlassian Marketplace:
marketplace.atlassian.com/apps/1014681/zephyr-essential-test-management-for-jira