The philosophy behind the concept and the idea of paralllelism is: using bigger screens or more screens; viewports or web-frames; or different layers with information as pieces of papers on a desk: as windows as recommend in the desk-top-philosophy.
In this scheme you see - schematic - a simulation based open learning environment with a lot of parallel windows even parallel paper materials, all the important information for solving the problem is in view and the user have them all under control.
We suppose that a user can only work or learn as his environment has been designed in such a way that all relevant information, to take decisions, is visible or can be immediately retrieved. On studying various kinds and large numbers of examples, it turned out time and again that parallel presented instruction yielded better results than simple provided in an hypermedium or simple structured web-site.
It is clear that users of educative software like to have all information well-ordered and at hand. The learner want to be able to see the connection or coherence of things. The fact that large screens are so popular partly proves the ideas found on parallelism. Users want to be able to put relevant information somewhere, preferably on a large screen, so that they can consult it without having to move other relevant information from the screen.
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A comparison of tiled and overlapping windows. Proceedings of the CHI 86, human factors in computing systems conference, 101-106. New York: Assiociation for computing machinery.
Enschede, august 2001