<s>
Barrier	B-General_Concept
pointing	I-General_Concept
(	O
or	O
"	O
edge	O
pointing	O
"	O
)	O
is	O
a	O
term	O
used	O
in	O
human	O
–	O
computer	O
interaction	O
to	O
describe	O
a	O
design	O
technique	O
in	O
which	O
targets	O
are	O
placed	O
on	O
the	O
peripheral	O
borders	O
of	O
touchscreen	B-Device
interfaces	I-Device
to	O
aid	O
in	O
motor	O
control	O
.	O
</s>
<s>
Where	O
targets	O
are	O
placed	O
alongside	O
raised	O
edges	O
on	O
mobile	O
devices	O
,	O
the	O
user	O
has	O
a	O
physical	O
barrier	O
to	O
aid	O
navigation	O
,	O
useful	O
for	O
situational	O
impairments	O
such	O
as	O
walking	O
;	O
similarly	O
,	O
screen	O
edges	O
that	O
stop	O
the	O
cursor	B-Application
mean	O
that	O
targets	O
placed	O
along	O
screen	O
edges	O
require	O
less	O
precise	O
movements	O
to	O
select	O
.	O
</s>
<s>
This	O
allows	O
the	O
most	O
common	O
or	O
important	O
functions	O
to	O
be	O
placed	O
on	O
the	O
edge	O
of	O
a	O
user	B-Application
interface	I-Application
,	O
while	O
other	O
functions	O
that	O
may	O
require	O
more	O
precision	O
can	O
utilise	O
the	O
interface	O
's	O
'	O
open	O
space	O
 '	O
.	O
</s>
<s>
Barrier	B-General_Concept
pointing	I-General_Concept
is	O
also	O
a	O
term	O
used	O
in	O
accessible	O
design	O
,	O
as	O
a	O
design	O
technique	O
that	O
makes	O
targets	O
easier	O
to	O
press	O
.	O
</s>
<s>
For	O
example	O
,	O
barrier	B-General_Concept
pointing	I-General_Concept
using	O
raised	O
edges	O
on	O
touchscreens	B-Device
,	O
alongside	O
a	O
stylus	B-Device
and	O
a	O
'	O
lift-off	O
'	O
or	O
'	O
take-off	O
'	O
selection	O
mode	O
,	O
can	O
improve	O
usability	O
for	O
a	O
user	O
with	O
cerebral	O
palsy	O
.	O
</s>
<s>
One	O
example	O
of	O
assistive	O
technology	O
focused	O
on	O
barrier	B-General_Concept
pointing	I-General_Concept
is	O
the	O
,	O
which	O
redesigns	O
the	O
size	O
,	O
shape	O
,	O
and	O
arrangement	O
of	O
interfaces	B-Application
based	O
on	O
its	O
measurement	O
of	O
motor	O
articulation	O
input	O
.	O
</s>
