<s>
A	O
Personal	B-Application
Shopping	I-Application
System	I-Application
(	O
PSS	O
)	O
is	O
a	O
system	O
designed	O
to	O
help	O
customers	O
with	O
their	O
purchases	O
in	O
a	O
supermarket	O
or	O
any	O
kind	O
of	O
self-service	B-General_Concept
retailer	O
.	O
</s>
<s>
In	O
this	O
system	O
,	O
when	O
the	O
customer	O
arrives	O
at	O
a	O
supermarket	O
,	O
instead	O
of	O
picking	O
a	O
shopping	O
cart	O
,	O
he/she	O
picks	O
an	O
equipment	O
(	O
PDA	B-Application
or	O
similar	O
)	O
which	O
provides	O
a	O
friendly	O
shopping	O
interface	O
.	O
</s>
<s>
Using	O
some	O
known	O
technologies	O
(	O
barcode	O
or	O
RFID	B-Application
)	O
,	O
the	O
equipment	O
is	O
capable	O
of	O
showing	O
on	O
the	O
screen	O
all	O
sort	O
of	O
information	O
about	O
any	O
product	O
available	O
on	O
the	O
shelves	O
.	O
</s>
