In this book several concepts with respect to the development and
reusability of multimedia content in web-based learning systems are
introduced. More specifically, the development of a component-based
framework that enables developers to employ reusable software components
enhanced with metadata, creating complete instructional visualizations
for a given subject and integrating these visualizations in an
appropriate learning context, is discussed. Two activities for making
stand-alone visualizations group-aware are addressed: transparent
sharing of the same instructional visualization with diverse views in a
moderated session, and organization of interactions in the shared
workspace. No other work has addressed the issue of transparent
collaboration based on instructional visualizations enhanced with
metadata in such a way.