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\emph{\fontshape{sc} Abstract}
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The purpose of this document is to present the OpenTURNS-FFTW module.

This document is organised according to the Open TURNS documentation :
\begin{itemize}
\item a \itshape{Reference Guide} which gives some theoretical basis,
\item a \itshape{Use cases Guide} which details scripts in python (the Textual Interface langage of Open TURNS) and helps the User to learn as quickly as possible the manipulation of the $otfftw$ module,
\item the \itshape{User Manual} which details the $otfftw$ objects and give the list of their methods,
\item the \itshape{Examples Guide} which provides at the moment only one example performed with the $otfftw$ module.
\end{itemize}

