The invention includes structures and schema for organizing and inter-relating objects, data, or files, including relational, network, hierarchical, and entity-relationship models, among others, that are dynamic, that is changing with time. This includes manipulating structures by conversion, compression, compaction, and compilation, for various purposes. Also included is generating structures for storing, organizing, and managing dynamic objects for retrieval and presentation.A discussion group for collaborative participants is also provided. A time-based dynamic object within a plurality of stored dynamic objects is stored. Each dynamic objects comprises a plurality of predefined attribute fields. Requested dynamic objects are assembled in real time so that the requested dynamic objects are displayed on the basis of the start-time attribute field of each requested dynamic object. A different threaded discussion associated with the each displayed requested dynamic object is provided with each displayed requested dynamic object based on the displayed requested dynamic object's start time.