<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
the	O
gulf	B-General_Concept
of	I-General_Concept
evaluation	I-General_Concept
is	O
the	O
degree	O
to	O
which	O
the	O
system	O
or	O
artifact	O
provides	O
representations	O
that	O
can	O
be	O
directly	O
perceived	O
and	O
interpreted	O
in	O
terms	O
of	O
the	O
expectations	O
and	O
intentions	O
of	O
the	O
user	O
.	O
</s>
<s>
Or	O
put	O
differently	O
,	O
the	O
gulf	B-General_Concept
of	I-General_Concept
evaluation	I-General_Concept
is	O
the	O
difficulty	O
of	O
assessing	O
the	O
state	O
of	O
the	O
system	O
and	O
how	O
well	O
the	O
artifact	O
supports	O
the	O
discovery	O
and	O
interpretation	O
of	O
that	O
state	O
.	O
</s>
<s>
In	O
human	O
–	O
computer	O
interaction	O
,	O
the	O
term	O
of	O
gulf	B-General_Concept
of	I-General_Concept
evaluation	I-General_Concept
stands	O
for	O
the	O
psychological	O
gap	O
that	O
must	O
be	O
crossed	O
to	O
interpret	O
a	O
user	O
interface	O
display	O
,	O
following	O
the	O
steps	O
:	O
interface	O
→	O
perception	O
→	O
interpretation	O
→	O
evaluation	O
.	O
</s>
