<s>
Rule-based	O
truth-maintenance	O
systems	O
:	O
These	O
systems	O
were	O
the	O
first	O
generation	O
of	O
configuration	O
engines	O
,	O
launched	O
in	O
the	O
1970s	O
based	O
on	O
research	O
results	O
in	O
artificial	B-Application
intelligence	I-Application
going	O
back	O
to	O
the	O
1960s	O
.	O
</s>
<s>
Constraint	B-Application
satisfaction	I-Application
engines	I-Application
:	O
These	O
engines	O
were	O
developed	O
in	O
the	O
1980s	O
and	O
1990s	O
.	O
</s>
<s>
Compile-based	O
configurators	O
:	O
These	O
configurators	O
build	O
upon	O
constraint-based	O
engines	O
and	O
research	O
in	O
Binary	B-Application
Decision	I-Application
Diagrams	I-Application
.	O
</s>
