Conclusions
Figure 8: Comparison of Erikson s Curve and the Technical
Information Curve
Conclusions
This chapter began by defining usability as the
ease
with which users can
perform
tasks
effectively
and
efficiently
and their level of
satisfaction
with
their work. Having discussed the various factors which contribute to usabil-
ity, we set about understanding the nature of usability.
Usability means that
products must take users’ mental abilities and limitations into account. To
understand usability, it was necessary to explore the various systems and
processes that make up human cognition. Human
cognition is likened to an
information processing system in that humans receive data or information
from their surroundings which they then process. These processes enable
humans to make sense of the information they require
and to decide what,
if anything, can be done with it. If a response is necessary, our cognitive
processes help us select the appropriate course of action. Sight, the
human
sense which provides the most important sensory input in relation to user
guides, was discussed and its capabilities and limitations were outlined.
We have seen that sensory input is subjected to several,
often complex
processes in short-term memory (STM). It is here that we decide on
courses of action and from here that information passes on to long-term
memory (LTM). Armed
with this knowledge, we can see how it is that
printed words are converted into information that we can use and how this
information needs to be processed in order for us to remember or learn it.
Of course, the flow of information from STM
to LTM is not automatic,
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