1. W. Wooden, D. McCarthy, B. Luzum EOP Prediction Users

2. User Information Sources of Information Sources of Information Survey questionnaires Survey questionnaires Product usage Product usage Interactive feedback Interactive feedback Future Expectations? Future Expectations?

3. Who are the Users?  Operational System Engineers  Academics  Scientists

4. Why do they want predictions? Positioning and Navigation Research Pointing Timekeeping

5. What do they want? Users’ Manual Data Accurate Dependable User friendly DELIVER ON DEMAND SOFTWARE With Test Data It depends on the application

6. General Requirements One unique set of IERS prediction products Easily accessible User friendly Reliable Meets users’ needs for Accuracy Update frequency Spacing Prediction interval Metadata

7. Accuracy? Operational and Scientific Users of Polar Motion Predictions Operational and Scientific Users of UT1-UTC Predictions

8. Prediction Length? Operational Users Scientific Users

9. Update Frequency? Operational Users Scientific Users

10. Spacing? Operational Users Scientific Users (Some also want analytical expressions)

11. How do they want to receive predictions? Operational Users Scientific Users

12. Future Users? Probably about the same mix of operational and scientific users Probably about the same mix of operational and scientific users Some “specialty” users Some “specialty” users Real-time availability Real-time availability Particularly UT1 Particularly UT1 Order of magnitude improvement in accuracy Order of magnitude improvement in accuracy New Products New Products