is easy to calculate what percentage of the work has already been done by the machine
and display this information on the screen. If it is not possible to predict the
processing time (or it is not possible to show the user what percentage of the total has
already been processed
—
the processing time is likely to vary according to the perfor-
mance of the user
’
s machine), then an infinite status bar is used. This moves from
right to left. This signals the user that the operation is still being executed. A typical
case might be loading a file of unknown length from the Internet (but it is
recommended to avoid this feature if possible).
2.4.1 User attention
Techniques for gaining user attention need to be handled very carefully, especially
when designing software. Various flashing banners and pop-ups are usually
distracting. The same goes for very rich colors. Users tend to ignore overly significant
elements, and the so-called Banner Blindness phenomenon arises. Too strong elements
are ignored by users as if they were ads.
It is also advisable not to use more than four different font sizes on one page and a
maximum of three different fonts, and it is also not advisable to write only in capital
letters. Use text underlining and highlighting only rarely.
NOTE
: Underlining the letters in a word is a very useful UI element. The so-called
mnemonic aids help to use shortcuts for various operations, see: CTRL + S = Save
…
Unfortunately, these aids disappear from new operating systems. However,
orientation-intensive tools, where the user is expected to adapt deeply to the machine
and use abbreviations, still use them.
2.4.2 First-Time experience
This rule (confirmed by J.Pavlí
č
ek, R. Bock during the UI Studies) says that there is
a very close correlation between how the solution is given to the user (in our case
primarily software, but it can also be HW and SW = mobile phone) acts during the
first hour. If the user is still not safe in the basic user goals after the first hour of using
the solution, then his willingness to use it decreases. This is a very dangerous condi-
tion. It affects all software solutions that are not highly specialized for a given activity
and are in fact a trend issue: be it Open-Source SW, operating system, and mobile
phone programs, after the personal computer operating system.
2.4.3 Houmer Simpson Car issue
The user interface must meet a perfectly limited area of requirements. Respec-
tively, it must be specialized for primary persons. The success of the overall solution is
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