Résumé : A form processing application (such as HP TeleForm) allows transforming scanned forms in an electronic format. The aim of the contribution is to present the whole development of such a solution in a practical project where the team had no previous knowledge on this matter. We discuss the advantages and the limits of the approach, the changes in the way the questionnaire is designed and the data collected. Its costs are also addressed (licenses, hardware, workforce). Moreover, we present the duration of each step of the encoding phase. Finally, the quality of the process is assessed and discussed.