You can assign those resources as reviewers. Reviewers cannot change anything in the Project. However they can:
- View the project structure of the work items to which they are assigned to.
- Add collaboration items: notes, posts, emails for most work items in the project structure.
A reviewer role gives users the ability to view the full project as a supervisor or assurer that the correct infrastructure is in place for the project to be executed successfully.
You can find more information here: http://usermanual.clarizen.com/#1-4-1-about-user-types/roles.
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All the best,