How to allow the user to take only one task at a time?

[nishanth]

I have number of tasks assigned to a particular user.

How can I restrict the user to take only one task at a time that mean

User is allowed to have only one task in-progress status at a time. he is not allowed to have more than one task in in-progress status. Once he resolved he can take another task

please advice me on this

[Jobin Kuruvilla [Adaptavist]]

As Joe mentioned, there is nothing out of the box  to stop you from doing it. But there is probably a way to highlight it you are using JIRA Agile. In the Agile board, you can add a column constraint to have a maximum value of 1 and the column will go red when you have more than one issue in "In Progress".

It won't stop you from having more than one issue in "In Progress" but it is a visual indicator.

[Joe Pitt]

You can't out of the box. You may be able to add a script or find a plugin. Remember, any modifications you make, scripts you add, or plugins may not work in the next release. The major plugins will update their code, but it may not be available for a few months after the release comes out.