Note
- Projects, the all-new projects experience, is now available. For more information about Projects, see About Projects.
 - You can only create a new project (classic) for an organization, repository, or user that already has at least one project (classic). If you're unable to create a project (classic), create a project instead.
 
An outside collaborator is a person who isn't explicitly a member of your organization, but who has permissions to a project (classic) in your organization.
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In the upper-right corner of GitHub, select your profile photo, then click Your organizations.
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Click the name of your organization.
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Under your organization name, click Projects.

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Click Projects (classic).
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In the projects list, click the name of the project (classic).
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On the top-right side of the project (classic), click Menu.
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Click , then click Settings.

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In the left sidebar, click Collaborators.
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Under "Search by username, full name or email address", type the outside collaborator's name, username, or GitHub email.
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In the search results, click the correct username and click Add collaborator.
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Optionally, next to the new collaborator's name, use the drop-down menu and click the desired permission level: Read, Write, or Admin.