The data acquired during one Observing Period by the Wide Field Cameras (WFC1 and WFC2) of the SAX satellite will be received on so-called Final Observation Tapes (FOT) from the Science Data Centre (SDC). The specifications of the FOT is laid down in the "Mission Support Component FOT layout Document" (TPZ/GO.SDC-100/FOT-TN/SAX) This document describes the first two stages of the FOT data-processing for the WFCs. The first stage includes the extraction of all science data and housekeeping data plus some general satellite information data into a set of FITS files. Using WFC instrument and satellite HK parameters filtering and cleaning of the event data is performed. The second stage involves the Scientific Analysis. Presently the WFC software package is only available for UNIX based operating systems. The descripions are based on this assumption. All processing is done by invoking programs or scripts that allow the user to automatically invoke a sequenc of programs or apply programs to a set of data files. Of each program and script a detailed description will available. For getting a completer background of the technical issues the following reference material are recommended: - "Mission Support Component FOT layout Document" (TPZ/GO.SDC-100/FOT-TN/SAX) - "SAX Users's manual" (Alenia SX-MA-AI-019) Chapter 11 (Wide Field Cameras) - "Definition of the Flexible Image Transport System (FITS)" NOST 100-1.0 - "Users' Guide to FTOOLS" (HEASARC issue of Ftools)