• When client projects are enabled, you'll see a check box that lets you restrict permissions.

• Update permissions on existing items on the"Edit" screen.

• Basecamp lets you know which items are hidden from the client.

• Want to share an item with your client? Click the Change button to remove the permission setting. Anyone who can see an item can change the permission setting.

Things to keep in mind:

• Comments inherit the permission setting of their parent item. If your clients can't see the original message, they can't see the rest of the discussion either.
• You can restrict an entire to-do list, but not an individual task.
• When you move or copy an item, the permission setting will be retained.
• The client can't keep anything hidden from you.
• When a client adds someone to the project, that person will automatically be a client as well.