  This article presents the \emph{Serial and Unserial Methods} (SUM). The
algorithms are strongly related to the first part of a classical reference in
combinatorics, the \emph{Combinatorial algorithms for computers and
calculators}, from Albert Nijenhuis and Herbert Wilf. The \emph{Serial Method}
proposal is to obtain the output of a specific kind of combinatorial family
from its position on the list of all combinatorial possibilities. The
\emph{Unserial Method} is the inverted step of Serial Method, getting the
serial number from the combinatorial family given as input. The \emph{serial
number} is the position of the combinatorial family on the list.
