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 Quick Overview of ISO/IEC 11179 WebDAIS WebDAIS Model –Data Set Model –Variable Model ISO/IEC 11179 –Cube Model –Container Model –Administration Model –Miscellaneous Model

3. 28 May 2003IASSIST 2003 - Strength in Numbers3 ISO/IEC 11179 6 Part International Standard –First version completed in 2000 Under revision –Old - Specification and standardization of data elements –New - Metadata registries All freely available at ISO web site –www.iso.ch

4. 28 May 2003IASSIST 2003 - Strength in Numbers4 WebDAIS Harmonization Health Canada NESSTAR WebDAIS system –Harmonization of DDI, ISO/IEC 11179, DAIS

5. 28 May 2003IASSIST 2003 - Strength in Numbers5 WebDAIS Harmonization WebDAIS DAIS DDI ISO/IEC 11179

6. 28 May 2003IASSIST 2003 - Strength in Numbers6 WebDAIS Harmonization

7. 28 May 2003IASSIST 2003 - Strength in Numbers7 WebDAIS Model Imported from ISO/IEC 11179 –Administration functions WebDAIS will act as a registry –Concept management Enables harmonization of data Future –Build model for DDI –Harmonize with ISO/IEC 11179

8. 28 May 2003IASSIST 2003 - Strength in Numbers8 WebDAIS Model Model Components –Data Set Model –Variable Model –Cube Model –Container Model –Administration Model –Miscellaneous Model

9. 28 May 2003IASSIST 2003 - Strength in Numbers9 WebDAIS Model Data Set Model –DDI Perspective –New – Link to Variables Variables Associated with Many Data Sets

10. 28 May 2003IASSIST 2003 - Strength in Numbers10 WebDAIS Model Variable Model (ISO/IEC 11179) –Conceptual 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

11. 28 May 2003IASSIST 2003 - Strength in Numbers11 WebDAIS Model Variable Model (ISO/IEC 11179) –Representational Permissible Value –A value and the value meaning Value Domain –A set of permissible values Conceptual Domain –A set of value meanings

12. 28 May 2003IASSIST 2003 - Strength in Numbers12 WebDAIS Model Variable Model (ISO/IEC 11179) –Data Element Association of a DEC and a VD –ISO/IEC 11179 Core Model –Examples

13. 28 May 2003IASSIST 2003 - Strength in Numbers13 ISO/IEC 11179 - Core Model Data Element Value Domain Data Element ConceptConceptual Domain Conceptual Representational VariablesValues

14. 28 May 2003IASSIST 2003 - Strength in Numbers14 WebDAIS Model Variable Model (ISO/IEC 11179) – Example –Two Value Domains - Marital Status Codes – MSC 1 MSC 2 M;MarriedM;Married S;Never MarriedS;Not Married D;Divorced W;Widowed

15. 28 May 2003IASSIST 2003 - Strength in Numbers15 WebDAIS Model Variable Model (ISO/IEC 11179) - Example –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

16. 28 May 2003IASSIST 2003 - Strength in Numbers16 WebDAIS Model Data Elements - 4 Possibilities (ISO/IEC 11179) Emp-MS MSC 1 Res-MS MSC 2 DEC --> VD --> DE -->

17. 28 May 2003IASSIST 2003 - Strength in Numbers17 WebDAIS Model Cube Model –Strictly from DDI –Not in ISO/IEC 11179

18. 28 May 2003IASSIST 2003 - Strength in Numbers18 WebDAIS Model Container Model –Classification Scheme (ISO/IEC 11179) Bookmark List –Client Side – List of useful URLs Browse List –Server Side – Classify Objects by Server Variable Groups –Link Group of Variables, Based on Business Requirement

19. 28 May 2003IASSIST 2003 - Strength in Numbers19 WebDAIS Model Administration Model (ISO/IEC 11179) –Data Archive Data Library  Metadata Registry –ISO/IEC 11179 Metadata Registry – Really a Data Element + Value Domain + Concept Registry –Example – Car Registry Card Catalog  Administered Items Catalog Items  Model Attributes

20. 28 May 2003IASSIST 2003 - Strength in Numbers20 WebDAIS Model Administration Model (ISO/IEC 11179) –What Do You Want to Keep Track of? Descriptions of Objects –What Kind of Objects? DDI??  Data sets ISO/IEC 11179  Data Elements + Value Domains –Administered Item  Description of an Object

21. 28 May 2003IASSIST 2003 - Strength in Numbers21 WebDAIS Model Administration Model (ISO/IEC 11179) –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

22. 28 May 2003IASSIST 2003 - Strength in Numbers22 WebDAIS Model Miscellaneous Model –Other Stuff

23. 28 May 2003IASSIST 2003 - Strength in Numbers23 Differences among 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

24. 28 May 2003IASSIST 2003 - Strength in Numbers24 Differences among 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

25. 28 May 2003IASSIST 2003 - Strength in Numbers25 Differences among DDI, DAIS, and ISO/IEC 11179 DAIS –Concept of variable group Not a DEC May be added to ISO/IEC 11179

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