<s>
The	O
Xerox	B-Application
Development	I-Application
Environment	I-Application
was	O
one	O
of	O
the	O
first	O
Integrated	B-Application
development	I-Application
environments	I-Application
(	O
IDEs	O
)	O
.	O
</s>
<s>
It	O
was	O
first	O
implemented	O
on	O
the	O
Xerox	B-Device
Alto	I-Device
in	O
1977	O
.	O
</s>
