<s>
CPM-GOMS	B-General_Concept
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>
CPM-GOMS	B-General_Concept
stands	O
for	O
two	O
things	O
:	O
Cognitive	O
Perceptual	O
Motor	O
and	O
the	O
project	O
planning	O
technique	O
Critical	O
Path	O
Method	O
(	O
from	O
which	O
it	O
borrows	O
some	O
elements	O
)	O
.	O
</s>
<s>
CPM-GOMS	B-General_Concept
was	O
developed	O
in	O
1988	O
by	O
Bonnie	O
John	O
,	O
a	O
former	O
student	O
of	O
Allen	O
Newell	O
.	O
</s>
<s>
Unlike	O
the	O
other	O
GOMS	B-General_Concept
variations	O
,	O
CPM-GOMS	B-General_Concept
does	O
not	O
assume	O
that	O
the	O
user	O
's	O
interaction	O
is	O
a	O
serial	O
process	O
,	O
and	O
hence	O
can	O
model	O
multitasking	O
behavior	O
that	O
can	O
be	O
exhibited	O
by	O
experienced	O
users	O
.	O
</s>
<s>
The	O
technique	O
is	O
also	O
based	O
directly	O
on	O
the	O
model	B-General_Concept
human	I-General_Concept
processor	I-General_Concept
-	O
a	O
simplified	O
model	O
of	O
human	O
responses	O
.	O
</s>
<s>
Evaluators	O
begin	O
a	O
CPM-GOMS	B-General_Concept
analysis	O
in	O
the	O
same	O
way	O
they	O
would	O
a	O
CMN-GOMS	B-General_Concept
analysis	O
.	O
</s>
<s>
However	O
,	O
when	O
the	O
tasks	O
are	O
broken	O
down	O
just	O
to	O
the	O
level	O
where	O
they	O
are	O
still	O
perceptual	O
or	O
motor	O
,	O
the	O
evaluator	O
applies	O
techniques	O
from	O
the	O
model	B-General_Concept
human	I-General_Concept
processor	I-General_Concept
.	O
</s>
<s>
The	O
estimated	O
times	O
by	O
CPM-GOMS	B-General_Concept
are	O
generally	O
faster	O
since	O
they	O
do	O
not	O
allocate	O
as	O
much	O
time	O
to	O
the	O
"	O
prepare	O
for	O
action	O
"	O
type	O
operations	O
.	O
</s>
<s>
This	O
is	O
the	O
most	O
difficult	O
GOMS	B-General_Concept
technique	O
to	O
implement	O
.	O
</s>
<s>
Research	O
is	O
currently	O
being	O
conducted	O
to	O
improve	O
the	O
CPM-GOMS	B-General_Concept
technique	O
so	O
that	O
it	O
can	O
be	O
used	O
without	O
the	O
evaluator	O
having	O
a	O
high	O
level	O
understanding	O
of	O
the	O
GOMS	B-General_Concept
theoretical	O
foundations	O
.	O
</s>
