<s>
Proaftn	B-General_Concept
is	O
a	O
fuzzy	B-General_Concept
classification	I-General_Concept
method	O
that	O
belongs	O
to	O
the	O
class	O
of	O
supervised	B-General_Concept
learning	I-General_Concept
algorithms	O
.	O
</s>
<s>
The	O
acronym	O
Proaftn	B-General_Concept
stands	O
for	O
:	O
(	O
PROcédure	O
d'Affectation	O
Floue	O
pour	O
la	O
problématique	O
du	O
Tri	O
Nominal	O
)	O
,	O
which	O
means	O
in	O
English	O
:	O
Fuzzy	O
Assignment	O
Procedure	O
for	O
Nominal	O
Sorting	B-Algorithm
.	O
</s>
<s>
To	O
determine	O
the	O
fuzzy	O
indifference	O
relations	O
,	O
PROAFTN	B-General_Concept
uses	O
the	O
general	O
scheme	O
of	O
the	O
discretization	O
technique	O
described	O
in	O
,	O
that	O
establishes	O
a	O
set	O
of	O
pre-classified	O
cases	O
called	O
a	O
training	O
set	O
.	O
</s>
<s>
To	O
resolve	O
the	O
classification	O
problems	O
,	O
Proaftn	B-General_Concept
proceeds	O
by	O
the	O
following	O
stages	O
:	O
</s>
<s>
Furthermore	O
,	O
several	O
heuristics	B-Algorithm
and	O
metaheuristics	B-Algorithm
were	O
used	O
to	O
learn	O
the	O
multicriteria	O
classification	O
method	O
Proaftn	B-General_Concept
.	O
</s>
<s>
Assignment	O
:	O
After	O
conceiving	O
the	O
prototypes	O
,	O
Proaftn	B-General_Concept
proceeds	O
to	O
assign	O
the	O
new	O
objects	O
to	O
specific	O
classes	O
.	O
</s>
