During the last decade, the computer have become more like a machinefor processing media. Now, all types of media can be integrated in thecomputer, thus the computer can be regarded as a meta-medium. Theintegration of different types of media into one document is calledmultimedia. In this thesis I study how multimedia-presentations can bestructured and how this structure can be visualized.
Design of tools for constructing and presentingmultimedia-presentations are still at an experimental level, and havenot yet reached a stability. I present two tools, one for bothconstructing and exploring multimedia-presentations, and another forexploring multimedia-presentations. The tools have been designed aspart of a project called Lava Learning. The tools have been tested inan educational setting, and I study how the structure and thevisualization of structure chosen works.
The tools that I have analyzed have a basic linear structure. Despiteof that, my investigations indicate that a tool for constructing andexploring multimedia-presentations can support many kinds of meaningfuluse. Such a tool can also be designed to support more than onemetaphor from traditional media.
Multimedia can have a quite complex structure. Different types ofmedia relates differently to time, and this can cause co-ordinationproblems when they are integrated into one document. It can benecessary to have more than one visualization of the structure,because of this. By visualizing the structure at more than one level,the user can gain deeper insight and get a better understanding of themultimedia-presentation. It also makes navigation in themultimedia-presentation easier.