<s>
Fan-out	B-General_Concept
has	O
multiple	O
meanings	O
in	O
software	B-General_Concept
engineering	I-General_Concept
.	O
</s>
<s>
In	O
message-oriented	B-Application
middleware	I-Application
solutions	O
,	O
fan-out	B-General_Concept
is	O
a	O
messaging	B-Operating_System
pattern	I-Operating_System
used	O
to	O
model	O
an	O
information	O
exchange	O
that	O
implies	O
the	O
delivery	O
(	O
or	O
spreading	O
)	O
of	O
a	O
message	O
to	O
one	O
or	O
multiple	O
destinations	B-Operating_System
possibly	O
in	O
parallel	O
,	O
and	O
not	O
halting	O
the	O
process	O
that	O
executes	O
the	O
messaging	O
to	O
wait	O
for	O
any	O
response	O
to	O
that	O
message	O
.	O
</s>
<s>
In	O
software	B-General_Concept
construction	I-General_Concept
,	O
the	O
fan-out	B-General_Concept
of	O
a	O
class	O
or	O
method	O
is	O
the	O
number	O
of	O
other	O
classes	O
used	O
by	O
that	O
class	O
or	O
the	O
number	O
of	O
other	O
methods	O
called	O
by	O
that	O
method	O
.	O
</s>
<s>
Additionally	O
,	O
fan-out	B-General_Concept
has	O
impact	O
on	O
the	O
quality	O
of	O
a	O
software	O
.	O
</s>
