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Knowing what to do (Constraints that force the behavior (Forcing functions…
Knowing what to do
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Sound as a signifier
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Orientation
The sound will make it possible to determine where the
vehicle is located,
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Constraints
Physical
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they rely upon properties of the physical world for
their operation; no special training is necessary
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Cultural
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guidelines for cultural behavior are represented in the mind by schemas, knowledge structures that contain the general rules and information necessary for interpreting situations and for guiding behavior.
social constraints on acceptable behavior are called “frames,” they govern behavior even when a person is in a novel situation or novel culture
Constraints
Semantic
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Semantic constraints are those
that rely upon the meaning of the situation to control the set of
possible actions
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Logical
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there is a logical relationship between the spatial or functional layout of components and the things that they affect or are affected by
Cultural norms
Conventions are actually a form of cultural constraint, usually associated with how people behave
conventions are codified into international standards, sometimes into laws, and sometimes both