The most significant modification to NEFCLASS was to introduce a
matrix 
containing the misclassification costs. This is basically a
n by (n+1) matrix, where the 
represent the costs caused
if the system classifies a pattern of class i as class j, or as
ambiguous (j=n+1).
The diagonal elements 
are usually equal
to 0, all other elements are set to 1 by default. If the domain
bears asymmetries of the classes this matrix allows rather fine and intuitive
adaption of the errors.
The next sections describe the modifications, that had to be performed to take this misclassification cost matrix into account.