We do this by examining what interaction complexity is and what causes it. This leads to a theory (or model) of interaction complexity that consists of four different types of complexity. This is what we write (on p 85).
"We will identify and define four main loci of complexity of an artifact or system (see figure 5.1), all with respect to its designed purpose:
1. internal complexity
2. external complexity
3. interaction complexity
4. mediated complexity
These four loci should not be thought of as different measures or types
of complexity; they represent a rough division into the main (more or less abstract) locations where complexity is residing in varying degrees, and manifesting itself in various ways."
and figure 5.1 lays out how these different forms of complexity relate to each other.
After having worked with this model for quite some time, I find it quite useful and it helps to understand many aspects of interactivity and its relation to complexity. One of the major consequences of the model is that it indicates (strongly) that there is no easy "fix". To design for simplicity does not have any optimal solutions, every design decision about how to handle (or where to put complexity) leads to serious trade-offs that are inevitable.
This is why I believe that understanding this model can help and prepare every interaction designer to better approach the design of any interactive system and device.
This is why I believe that understanding this model can help and prepare every interaction designer to better approach the design of any interactive system and device.
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