<s>
Program	B-Application
lifecycle	I-Application
phases	I-Application
are	O
the	O
stages	O
a	O
computer	B-Application
program	I-Application
undergoes	O
,	O
from	O
initial	O
creation	O
to	O
deployment	O
and	O
execution	B-General_Concept
.	O
</s>
<s>
The	O
phases	O
are	O
edit	B-Application
time	I-Application
,	O
compile	B-Application
time	I-Application
,	O
link	B-Application
time	I-Application
,	O
distribution	B-Application
time	I-Application
,	O
installation	B-Application
time	I-Application
,	O
load	B-Operating_System
time	I-Operating_System
,	O
and	O
run	B-Library
time	I-Library
.	O
</s>
<s>
For	O
example	O
,	O
when	O
modifying	O
a	O
program	O
,	O
software	B-Application
developers	I-Application
may	O
need	O
to	O
repeatedly	O
edit	O
,	O
compile	B-Language
,	O
install	O
,	O
and	O
execute	O
it	O
on	O
their	O
own	O
computers	O
to	O
ensure	O
sufficient	O
quality	O
before	O
it	O
can	O
be	O
distributed	O
to	O
users	O
;	O
copies	O
of	O
the	O
modified	O
program	O
are	O
then	O
downloaded	O
,	O
installed	O
,	O
and	O
executed	O
by	O
users	O
on	O
their	O
computers	O
.	O
</s>
<s>
Edit	B-Application
time	I-Application
is	O
when	O
the	O
source	O
code	O
of	O
the	O
program	O
is	O
being	O
edited	O
.	O
</s>
<s>
This	O
spans	O
initial	O
creation	O
to	O
any	O
bug	B-Error_Name
fix	O
,	O
refactoring	O
,	O
or	O
addition	O
of	O
new	O
features	B-Architecture
.	O
</s>
<s>
Editing	O
is	O
typically	O
performed	O
by	O
a	O
person	O
,	O
but	O
automated	O
design	O
tools	O
and	O
metaprogramming	B-Application
systems	O
may	O
also	O
be	O
used	O
.	O
</s>
<s>
Compile	B-Application
time	I-Application
is	O
when	O
source	O
code	O
is	O
translated	O
into	O
machine	B-Language
code	I-Language
by	O
a	O
compiler	B-Language
.	O
</s>
<s>
The	O
result	O
of	O
a	O
successful	O
compilation	B-Language
is	O
an	O
executable	B-Application
.	O
</s>
<s>
Link	B-Application
time	I-Application
connects	O
all	O
of	O
the	O
necessary	O
machine	B-Language
code	I-Language
components	O
of	O
a	O
program	O
,	O
including	O
externals	O
.	O
</s>
<s>
It	O
is	O
very	O
common	O
for	O
programs	O
to	O
use	O
functions	O
implemented	O
by	O
external	O
libraries	B-Library
,	O
all	O
of	O
which	O
must	O
be	O
properly	O
linked	O
together	O
.	O
</s>
<s>
There	O
are	O
two	O
types	O
of	O
linking	B-Application
.	O
</s>
<s>
Static	B-Library
linking	I-Library
is	O
when	O
the	O
connection	O
is	O
made	O
by	O
the	O
compiler	B-Language
,	O
which	O
is	O
always	O
prior	O
to	O
execution	B-General_Concept
.	O
</s>
<s>
Dynamic	B-Application
linking	I-Application
,	O
however	O
,	O
is	O
performed	O
by	O
the	O
operating	B-General_Concept
system	I-General_Concept
(	O
OS	O
)	O
just	O
before	O
,	O
or	O
even	O
during	O
,	O
execution	B-General_Concept
.	O
</s>
<s>
Distribution	B-Application
time	I-Application
is	O
the	O
process	O
of	O
transferring	O
a	O
copy	O
of	O
a	O
program	O
to	O
a	O
user	O
.	O
</s>
<s>
The	O
distribution	O
format	O
is	O
typically	O
an	O
executable	B-Application
,	O
but	O
may	O
also	O
be	O
source	O
code	O
,	O
especially	O
for	O
a	O
program	O
written	O
in	O
an	O
interpreted	B-Application
language	I-Application
.	O
</s>
<s>
Installation	B-Application
time	I-Application
gets	O
the	O
distributed	O
program	O
ready	O
for	O
execution	B-General_Concept
on	O
the	O
user	O
's	O
computer	O
,	O
which	O
often	O
includes	O
storing	O
the	O
executable	B-Application
for	O
future	O
loading	O
by	O
the	O
OS	O
.	O
</s>
<s>
Load	B-Operating_System
time	I-Operating_System
is	O
when	O
the	O
OS	O
takes	O
the	O
program	O
's	O
executable	B-Application
from	O
storage	O
,	O
such	O
as	O
a	O
hard	B-Device
drive	I-Device
,	O
and	O
places	O
it	O
into	O
active	O
memory	B-General_Concept
,	O
in	O
order	O
to	O
begin	O
execution	B-General_Concept
.	O
</s>
<s>
Run	B-Library
time	I-Library
is	O
the	O
execution	B-General_Concept
phase	O
,	O
when	O
the	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
executes	O
the	O
program	O
's	O
machine	B-Language
code	I-Language
instructions	O
.	O
</s>
<s>
If	O
execution	B-General_Concept
terminates	O
it	O
will	O
either	O
be	O
normal	O
,	O
expected	O
behavior	O
or	O
an	O
abnormality	O
such	O
as	O
a	O
crash	B-General_Concept
.	O
</s>
