A milestone is visible by admins only and could be an Open House, Interview, picking up the school uniform, etc. You can include milestones or internal checkpoint items in your registration packet or re-enrollment packet. Click here for registration instructions. The steps are similar if you'd like to include a milestone in your re-enrollment packet.
Once these internal milestones have been completed, you can mark them as "verified" using the checklist action button within the Manage Registrations or Manage Re-enrollments screen.