<s>
A	O
Gantt	B-Application
chart	I-Application
is	O
a	O
bar	B-Application
chart	I-Application
that	O
illustrates	O
a	O
project	O
schedule	O
.	O
</s>
<s>
Modern	O
Gantt	B-Application
charts	I-Application
also	O
show	O
the	O
dependency	O
relationships	O
between	O
activities	O
and	O
the	O
current	O
schedule	O
status	O
.	O
</s>
<s>
A	O
Gantt	B-Application
chart	I-Application
is	O
a	O
type	O
of	O
bar	B-Application
chart	I-Application
that	O
illustrates	O
a	O
project	O
schedule	O
.	O
</s>
<s>
Gantt	B-Application
charts	I-Application
illustrate	O
the	O
start	O
and	O
finish	O
dates	O
of	O
the	O
terminal	O
elements	O
and	O
summary	O
elements	O
of	O
a	O
project	O
.	O
</s>
<s>
Modern	O
Gantt	B-Application
charts	I-Application
also	O
show	O
the	O
dependency	O
(	O
i.e.	O
,	O
precedence	O
network	O
)	O
relationships	O
between	O
activities	O
.	O
</s>
<s>
Gantt	B-Application
charts	I-Application
can	O
be	O
used	O
to	O
show	O
current	O
schedule	O
status	O
using	O
percent-complete	O
shadings	O
and	O
a	O
vertical	O
"	O
TODAY	O
"	O
line	O
.	O
</s>
<s>
Gantt	B-Application
charts	I-Application
are	O
sometimes	O
equated	O
with	O
bar	B-Application
charts	I-Application
.	O
</s>
<s>
Gantt	B-Application
charts	I-Application
are	O
usually	O
created	O
initially	O
using	O
an	O
early	O
start	O
time	O
approach	O
,	O
where	O
each	O
task	O
is	O
scheduled	O
to	O
start	O
immediately	O
when	O
its	O
prerequisites	O
are	O
complete	O
.	O
</s>
<s>
Although	O
widely	O
used	O
in	O
project	O
planning	O
in	O
the	O
present	O
day	O
,	O
Gantt	B-Application
charts	I-Application
were	O
considered	O
revolutionary	O
when	O
introduced	O
.	O
</s>
<s>
In	O
1912	O
,	O
published	O
what	O
could	O
be	O
considered	O
Gantt	B-Application
charts	I-Application
while	O
discussing	O
a	O
construction	O
project	O
.	O
</s>
<s>
Unlike	O
later	O
Gantt	B-Application
charts	I-Application
,	O
Schürch	O
's	O
charts	O
did	O
not	O
display	O
interdependencies	O
,	O
leaving	O
them	O
to	O
be	O
inferred	O
by	O
the	O
reader	O
.	O
</s>
<s>
One	O
of	O
the	O
first	O
major	O
applications	O
of	O
Gantt	B-Application
charts	I-Application
was	O
by	O
the	O
United	O
States	O
during	O
World	O
War	O
I	O
,	O
at	O
the	O
instigation	O
of	O
General	O
William	O
Crozier	O
.	O
</s>
<s>
The	O
earliest	O
Gantt	B-Application
charts	I-Application
were	O
drawn	O
on	O
paper	O
and	O
therefore	O
had	O
to	O
be	O
redrawn	O
entirely	O
in	O
order	O
to	O
adjust	O
to	O
schedule	O
changes	O
.	O
</s>
<s>
For	O
many	O
years	O
,	O
project	O
managers	O
used	O
pieces	O
of	O
paper	O
or	O
blocks	O
for	O
Gantt	B-Application
chart	I-Application
bars	O
so	O
they	O
could	O
be	O
adjusted	O
as	O
needed	O
.	O
</s>
<s>
Gantt	O
's	O
collaborator	O
Walter	O
Polakov	O
introduced	O
Gantt	B-Application
charts	I-Application
to	O
the	O
Soviet	O
Union	O
in	O
1929	O
when	O
he	O
was	O
working	O
for	O
the	O
Supreme	O
Soviet	O
of	O
the	O
National	O
Economy	O
.	O
</s>
<s>
In	O
the	O
1980s	O
,	O
personal	B-Device
computers	I-Device
allowed	O
widespread	O
creation	O
of	O
complex	O
and	O
elaborate	O
Gantt	B-Application
charts	I-Application
.	O
</s>
<s>
With	O
the	O
advent	O
of	O
the	O
Internet	O
and	O
increased	O
collaboration	O
over	O
networks	O
at	O
the	O
end	O
of	O
the	O
1990s	O
,	O
Gantt	B-Application
charts	I-Application
became	O
a	O
common	O
feature	O
of	O
web-based	O
applications	O
,	O
including	O
collaborative	O
groupware	B-Application
.	O
</s>
<s>
By	O
2012	O
,	O
almost	O
all	O
Gantt	B-Application
charts	I-Application
were	O
made	O
by	O
software	O
which	O
can	O
easily	O
adjust	O
to	O
schedule	O
changes	O
.	O
</s>
<s>
In	O
1999	O
,	O
Gantt	B-Application
charts	I-Application
were	O
identified	O
as	O
"	O
one	O
of	O
the	O
most	O
widely	O
used	O
management	O
tools	O
for	O
project	O
scheduling	O
and	O
control	O
"	O
.	O
</s>
<s>
Once	O
this	O
step	O
is	O
complete	O
,	O
one	O
can	O
draw	O
a	O
Gantt	B-Application
chart	I-Application
or	O
a	O
network	O
diagram	O
.	O
</s>
<s>
In	O
a	O
progress	O
Gantt	B-Application
chart	I-Application
,	O
tasks	O
are	O
shaded	O
in	O
proportion	O
to	O
the	O
degree	O
of	O
their	O
completion	O
:	O
a	O
task	O
that	O
is	O
60%	O
complete	O
would	O
be	O
60%	O
shaded	O
,	O
starting	O
from	O
the	O
left	O
.	O
</s>
<s>
A	O
vertical	O
line	O
is	O
drawn	O
at	O
the	O
time	O
index	O
when	O
the	O
progress	O
Gantt	B-Application
chart	I-Application
is	O
created	O
,	O
and	O
this	O
line	O
can	O
then	O
be	O
compared	O
with	O
shaded	O
tasks	O
.	O
</s>
<s>
Linked	O
Gantt	B-Application
charts	I-Application
contain	O
lines	O
indicating	O
the	O
dependencies	O
between	O
tasks	O
.	O
</s>
<s>
However	O
,	O
linked	O
Gantt	B-Application
charts	I-Application
quickly	O
become	O
cluttered	O
in	O
all	O
but	O
the	O
simplest	O
cases	O
.	O
</s>
<s>
Nevertheless	O
,	O
Gantt	B-Application
charts	I-Application
are	O
often	O
preferred	O
over	O
network	O
diagrams	O
because	O
Gantt	B-Application
charts	I-Application
are	O
easily	O
interpreted	O
without	O
training	O
,	O
whereas	O
critical	O
path	O
diagrams	O
require	O
training	O
to	O
interpret	O
.	O
</s>
<s>
Gantt	B-Application
chart	I-Application
software	I-Application
typically	O
provides	O
mechanisms	O
to	O
link	O
task	O
dependencies	O
,	O
although	O
this	O
data	O
may	O
or	O
may	O
not	O
be	O
visually	O
represented	O
.	O
</s>
<s>
Gantt	B-Application
charts	I-Application
and	O
network	O
diagrams	O
are	O
often	O
used	O
for	O
the	O
same	O
project	O
,	O
both	O
being	O
generated	O
from	O
the	O
same	O
data	O
by	O
a	O
software	O
application	O
.	O
</s>
