1. Questasy Technical Overview Alerk Amin

2. Data Dissemination Requirements Data collection Multiple languages One system –Data and metadata –Administrators and researchers

3. LISS Panel ~5000 households in Netherlands Studies conducted on various schedules Datasets prepared on various schedules Comparability

4. Solution: Questasy Developed by CentERdata Web application Manage and distribute survey data and metadata

5. Administrator Interface Upload data files Enter survey metadata Manage security

6. Researcher Interface Browse and search survey metadata Download data files

7. Questasy Website Integration Questasy www.lissdata.nl /lissdata Researcher Interface (External) Database Administrator Interface (Internal) Static Web Pages (External) /dataarchive

8. Questasy Implementation MVC Architecture Model based on DDI 3 Search

9. MVC Architecture Questasy Client (Web Browser) Database Model ControllerSecurity ViewDispatcher Internet 1 2 3 4 5 6 7 8 9

10. DDI 3 Emerging standard for data documentation Longitudinal studies Elements and relationships

11. DDI 3 Relationships in Model Question Item Question Scheme (n:1) Response Domain (n:1) Question Constructs (1:n) Variables (n:m) Concepts (n:m)

12. DDI 3 in Database

13. Search Researcher interface Sphinx search engine

14. Demonstration www.lissdata.nl