<s>
NGOMSL	B-General_Concept
(	O
Natural	O
GOMS	B-General_Concept
Language	O
)	O
is	O
a	O
variation	O
of	O
the	O
GOMS	B-General_Concept
technique	O
in	O
human	O
computer	O
interaction	O
.	O
</s>
<s>
Natural	O
GOMS	B-General_Concept
Language	O
technique	O
was	O
developed	O
by	O
David	O
Kieras	O
in	O
1988	O
.	O
</s>
<s>
The	O
motivation	O
was	O
to	O
make	O
GOMS/CCT	O
(	O
cognitive	O
complexity	O
theory	O
)	O
simple	O
to	O
use	O
,	O
and	O
still	O
keep	O
the	O
power	O
and	O
flexibility	O
of	O
standard	O
GOMS	B-General_Concept
.	O
</s>
<s>
This	O
was	O
necessary	O
because	O
GOMS	B-General_Concept
did	O
not	O
have	O
very	O
well	O
defined	O
semantics	O
.	O
</s>
<s>
Kieras	O
's	O
result	O
was	O
the	O
development	O
of	O
high-level	O
(	O
natural	O
language	O
)	O
syntax	O
for	O
GOMS	B-General_Concept
representation	O
with	O
directions	O
for	O
doing	O
a	O
GOMS	B-General_Concept
evaluation	O
.	O
</s>
<s>
Since	O
NGOMSL	B-General_Concept
is	O
based	O
on	O
CCT	O
,	O
it	O
has	O
certain	O
properties	O
that	O
make	O
it	O
unique	O
.	O
</s>
<s>
NGOMSL	B-General_Concept
inherits	O
the	O
ability	O
to	O
not	O
only	O
give	O
estimations	O
for	O
execution	O
times	O
but	O
it	O
can	O
also	O
estimate	O
the	O
time	O
taken	O
to	O
learn	O
how	O
to	O
use	O
the	O
system	O
.	O
</s>
<s>
NGOMSL	B-General_Concept
models	O
user	O
interaction	O
as	O
a	O
serial	O
operation	O
.	O
</s>
<s>
One	O
operation	O
occupies	O
the	O
user	O
completely	O
,	O
there	O
is	O
no	O
multitasking	O
,	O
which	O
makes	O
NGOMSL	B-General_Concept
inappropriate	O
for	O
analyzing	O
tasks	O
where	O
the	O
users	O
are	O
under	O
time	O
pressure	O
,	O
highly	O
practiced	O
and	O
,	O
in	O
reality	O
,	O
do	O
act	O
in	O
a	O
parallel	O
fashion	O
.	O
</s>
