Once a kind of service data has been added to a plan, all users signed up to that plan can be given a value for that data-type (this works retroactively). In the example used in ‘The type of an Item of Service Data’, the user ‘Fred’ was given a discount of $10.00. Another user on the same plan could be given a discount of $12.00. These values can now be assigned during the user sign-up process, or possibly later, using the ‘View/Edit User’ tool. Prior to attaching the ‘Once off Discount’ kind of service data to this plan, we could not have set values for this data for these users.