<s>
The	O
principles	B-Application
of	I-Application
attention	I-Application
stress	I-Application
is	O
a	O
user	B-Application
interface	I-Application
design	O
theory	O
to	O
measure	O
the	O
amount	O
of	O
attention	O
that	O
is	O
required	O
to	O
perform	O
certain	O
tasks	O
in	O
a	O
web	O
application	O
.	O
</s>
<s>
Although	O
the	O
emergence	O
of	O
AJAX	B-General_Concept
provides	O
many	O
ways	O
to	O
reduce	O
attention	O
shift	O
,	O
the	O
paradox	O
between	O
attention	O
shift	O
and	O
selection	O
threshold	O
still	O
cannot	O
be	O
resolved	O
.	O
</s>
<s>
This	O
limit	O
is	O
termed	O
"	O
UI	O
capacity	O
"	O
in	O
the	O
principles	B-Application
of	I-Application
attention	I-Application
stress	I-Application
.	O
</s>
