This supplement contains documentation on the explicit and implicit stratification variables included in the TIMSS 2011 data files. The explicit strata are smaller sampling frames, created from the national sampling frames, from which national samples of schools were drawn. The implicit strata are nested within the explicit strata, and were used…

Reports on the results of research examining the ability of fourth and fifth grade science and social science students to use Dublin Core metadata elements to describe image resources for inclusion in a digital archive. Describes networked learning environments called Digital Portfolio Archives and discusses metadata for historical primary…