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The [ISO 1101] standard specifies the form errors with geometrical tolerancesusing the zone concept.To complete this concept, we present a generic methodwhich adapts to any geometry and allows to describe any kind of errors. Thus,wecan dissociate the part errors according to reference categories: position,orientation,form, waviness and roughnesses. Starting from a cloud of poindsrepresenting the error measurement, the "modal" method decompose, like Fourierseries,this error in a sum of sorted errors according to the ircomplexitydegree (a number of "wavinesses"). In addition, we propose to show, on a simpleexample, that according to error complexity to be characterized, aninterpolation by the modal method allows to optimize the measuring strategy.

Caract\'erisation des d\'efauts d'une surface sph\'erique par d\'ecomposition modale