<s>
User	B-Application
experience	I-Application
evaluation	I-Application
(	O
UXE	O
)	O
or	O
user	B-Application
experience	I-Application
assessment	O
(	O
UXA	O
)	O
refers	O
to	O
a	O
collection	O
of	O
methods	O
,	O
skills	O
and	O
tools	O
utilized	O
to	O
uncover	O
how	O
a	O
person	O
perceives	O
a	O
system	O
(	O
product	O
,	O
service	O
,	O
non-commercial	O
item	O
,	O
or	O
a	O
combination	O
of	O
them	O
)	O
before	O
,	O
during	O
and	O
after	O
interacting	O
with	O
it	O
.	O
</s>
<s>
It	O
is	O
non-trivial	O
to	O
assess	O
user	B-Application
experience	I-Application
since	O
user	B-Application
experience	I-Application
is	O
subjective	O
,	O
context-dependent	O
and	O
dynamic	O
over	O
time	O
.	O
</s>
<s>
Laboratory	O
experiments	O
may	O
work	O
well	O
for	O
studying	O
a	O
specific	O
aspect	O
of	O
user	B-Application
experience	I-Application
,	O
but	O
holistic	O
user	B-Application
experience	I-Application
is	O
optimally	O
studied	O
over	O
a	O
longer	O
period	O
of	O
time	O
with	O
real	O
users	O
in	O
a	O
natural	O
environment	O
.	O
</s>
<s>
In	O
all	O
cases	O
,	O
however	O
,	O
there	O
are	O
certain	O
aspects	O
of	O
user	B-Application
experience	I-Application
that	O
researchers	O
are	O
interested	O
in	O
(	O
measures	O
)	O
,	O
and	O
certain	O
procedures	O
and	O
techniques	O
used	O
for	O
collecting	O
the	O
data	O
(	O
methods	O
)	O
.	O
</s>
<s>
There	O
are	O
many	O
measures	O
and	O
some	O
high-level	O
constructs	O
of	O
user	B-Application
experience	I-Application
that	O
can	O
be	O
used	O
as	O
the	O
basis	O
for	O
defining	O
the	O
user	B-Application
experience	I-Application
measures	O
,	O
for	O
example	O
:	O
</s>
<s>
Usability	B-General_Concept
:	O
Does	O
the	O
user	O
feel	O
that	O
it	O
is	O
easy	O
and	O
efficient	O
to	O
get	O
things	O
done	O
with	O
the	O
system	O
?	O
</s>
<s>
To	O
properly	O
evaluate	O
user	B-Application
experience	I-Application
,	O
metrics	O
and	O
other	O
factors	O
surrounding	O
a	O
study	O
need	O
to	O
be	O
taken	O
into	O
account	O
,	O
for	O
example	O
:	O
</s>
<s>
An	O
individual	O
method	O
can	O
collect	O
data	O
about	O
a	O
set	O
of	O
specific	O
constructs	O
of	O
user	B-Application
experience	I-Application
.	O
</s>
<s>
For	O
instance	O
,	O
usability	B-General_Concept
testing	O
is	O
used	O
to	O
collect	O
data	O
about	O
usability	B-General_Concept
construct	O
.	O
</s>
<s>
An	O
important	O
aspect	O
of	O
explicit	O
methods	O
includes	O
usability	B-General_Concept
testing	O
and	O
emotion	O
evaluation	O
.	O
</s>
<s>
When	O
investigating	O
momentary	O
user	B-Application
experiences	I-Application
,	O
we	O
can	O
evaluate	O
the	O
level	O
of	O
positive	O
affect	O
,	O
negative	O
affect	O
,	O
joy	O
,	O
surprise	O
,	O
frustration	O
,	O
etc	O
.	O
</s>
<s>
Examples	O
of	O
longitudinal	O
UXA	O
methods	O
(	O
excluding	O
traditional	O
usability	B-General_Concept
methods	O
)	O
:	O
</s>
<s>
Once	O
specific	O
design	O
concepts	O
and	O
ideas	O
are	O
on	O
the	O
table	O
,	O
UXA	O
researchers	O
further	O
explore	O
how	O
people	O
react	O
to	O
them	O
regarding	O
desirability	O
,	O
findability	O
,	O
usefulness	O
,	O
credibility	O
,	O
accessibility	O
,	O
usability	B-General_Concept
and	O
human	O
factors	O
metrics	O
.	O
</s>
<s>
A	O
relatively	O
new	O
pursuit	O
in	O
video	O
game	O
play-testing	O
is	O
UX	O
and	O
usability	B-General_Concept
research	O
.	O
</s>
<s>
Researchers	O
use	O
a	O
variety	O
of	O
HCI	O
and	O
psychological	O
techniques	O
to	O
examine	O
the	O
effectiveness	O
of	O
the	O
user	B-Application
experience	I-Application
of	O
the	O
games	O
during	O
the	O
design	O
process	O
.	O
</s>
<s>
User	B-Application
experience	I-Application
evaluation	I-Application
has	O
become	O
common	O
practice	O
in	O
web	O
design	O
,	O
especially	O
within	O
organizations	O
implementing	O
user-centered	O
design	O
practices	O
.	O
</s>
<s>
Through	O
user	O
testing	O
,	O
the	O
user	B-Application
experience	I-Application
is	O
constantly	O
evaluated	O
throughout	O
the	O
whole	O
product	O
design	O
life-cycle	O
.	O
</s>
