1. Is Your Data Facility ISO Compliant? Progress Towards Harmonizing the DDI and ISO/IEC 11179 Dan Gillman Information Scientist US Bureau of Labor Statistics

2. 28 May 2003IASSIST 2003 - Strength in Numbers2 Introduction WebDAIS ISO/IEC 11179 –Core Model –Registration Differences between DDI, DAIS, 11179 WebDAIS model

3. 28 May 2003IASSIST 2003 - Strength in Numbers3 WebDAIS Harmonization Health Canada NESSTAR WebDAIS system –Harmonization of DDI, ISO/IEC 11179, DAIS

4. 28 May 2003IASSIST 2003 - Strength in Numbers4 WebDAIS Harmonization WebDAIS DAIS DDI ISO/IEC 11179

5. 28 May 2003IASSIST 2003 - Strength in Numbers5 WebDAIS Harmonization

6. 28 May 2003IASSIST 2003 - Strength in Numbers6 ISO/IEC 11179 6 Part International Standard Under revision –Old - Specification and standardization of data elements –New - Metadata registries All freely available at ISO web site –www.iso.ch

7. 28 May 2003IASSIST 2003 - Strength in Numbers7 ISO/IEC 11179 - Core Model Data Element Value Domain Data Element ConceptConceptual Domain Conceptual Representational VariablesValues

8. 28 May 2003IASSIST 2003 - Strength in Numbers8 ISO/IEC 11179 - Core Model Permissible Value –A value and the value meaning Value Domain –A set of permissible values Conceptual Domain –A set of value meanings

9. 28 May 2003IASSIST 2003 - Strength in Numbers9 ISO/IEC 11179 - Core Model Object Class (i.e., population) –A set of objects on which observations are taken Property (i.e., characteristic) –A feature that describes or distinguishes objects Data Element Concept –The concept formed by Object Class + Property

10. 28 May 2003IASSIST 2003 - Strength in Numbers10 ISO/IEC 11179 - Core Model Data Element –Association of a DEC and a VD Examples

11. 28 May 2003IASSIST 2003 - Strength in Numbers11 ISO/IEC 11179 - Core Model Two Data Element Concepts –DEC 1 –Object Class -- Employees of BLS –Property -- Marital Status –DEC 2 –Object Class -- Adult Residents of Ontario –Property -- Marital Status

12. 28 May 2003IASSIST 2003 - Strength in Numbers12 ISO/IEC 11179 - Core Model Two Value Domains - Marital Status Codes MSC 1 MSC 2 –M;MarriedM;Married –S;Never MarriedS;Not Married –D;Divorced –W;Widowed

13. 28 May 2003IASSIST 2003 - Strength in Numbers13 ISO/IEC 11179 - Core Model Data Elements - 4 Possibilities Emp-MS MSC 1 Res-MS MSC 2 DEC --> VD --> DE -->

14. 28 May 2003IASSIST 2003 - Strength in Numbers14 ISO/IEC 11179 - Core Model Model Rules and Constraints –Many DEs may use the same DEC –Many DEs may use the same VD

15. 28 May 2003IASSIST 2003 - Strength in Numbers15 ISO/IEC 11179 - Registration and Administration Registration - –Registration is the process whereby unambiguous identifiers are formally associated with objects. Administration - –Manages life-cycle of descriptions Administration records –Monitors quality of metadata Registration status –Applies to scope of registry, not just core model

16. 28 May 2003IASSIST 2003 - Strength in Numbers16 Differences between DDI, DAIS, and ISO/IEC 11179 DDI –Subject matter specific –End user perspective - “Metadata after the data” –XML DTD - not UML model –Data set oriented –Document oriented - codebook –“Study” is highest level of abstraction

17. 28 May 2003IASSIST 2003 - Strength in Numbers17 Differences between DDI, DAIS, and ISO/IEC 11179 ISO/IEC 11179 –Independent of particular subject matter –Producer perspective - “Metadata before the data” –UML model –Data and database oriented –“Concept” is highest level of abstraction –“Administration” is highest level of function

18. 28 May 2003IASSIST 2003 - Strength in Numbers18 Differences between DDI, DAIS, and ISO/IEC 11179 DAIS –Concept of variable group Not a DEC May be added to ISO/IEC 11179

19. 28 May 2003IASSIST 2003 - Strength in Numbers19 WebDAIS Model Imported from ISO/IEC 11179 –Administration functions WebDAIS will act as a registry –Concept management (DEC and CD) Enables harmonization of data Future –Build model for DDI –Harmonize with ISO/IEC 11179

20. Contact Dan Gillman Gillman.Daniel@BLS.Gov +1.202.691.7523