<s>
Items	O
get	O
assigned	O
to	O
a	O
particular	O
level	O
at	O
insert	O
(	O
using	O
some	O
predefined	O
algorithm	O
)	O
,	O
and	O
thus	O
cannot	O
be	O
moved	O
to	O
another	O
level	O
(	O
unlike	O
in	O
the	O
multilevel	B-Operating_System
feedback	I-Operating_System
queue	I-Operating_System
)	O
.	O
</s>
<s>
Each	O
queue	O
will	O
be	O
assigned	O
a	O
priority	O
and	O
will	O
have	O
its	O
own	O
scheduling	O
algorithm	O
like	O
Round-robin	B-Algorithm
scheduling	I-Algorithm
or	O
FCFS	B-Operating_System
.	O
</s>
<s>
Consider	O
the	O
following	O
table	O
with	O
the	O
arrival	O
time	O
,	O
execute	O
time	O
and	O
type	O
of	O
the	O
process	O
(	O
foreground	O
or	O
background	O
-	O
where	O
foreground	O
processes	O
are	O
given	O
high	O
priority	O
)	O
to	O
understand	O
non	O
pre-emptive	O
and	O
pre-emptive	O
multilevel	O
scheduling	O
in	O
depth	O
with	O
FCFS	B-Operating_System
algorithm	O
for	O
both	O
the	O
queues	O
:	O
</s>
