Checkbox allows you to configure how much access each admin user has. User roles control the type of actions an admin user can perform (such as creating a survey or viewing a report). Permissions at the survey, report, or folder level determine which items an admin user has access to. Other than the System Admin, or super-user role, all other admins can only see the items they create, by default. But if you want to share or collaborate with another user on your account, you can simply grant them access to your survey, report, folder, etc. and give them read/write/management access.