A process for determining the biofilm-producing capacity of a microorganism, comprising the following steps: a) introducing at least two particles into culture containers comprising a liquid culture medium suited to the growth of said microorganism, said particles resting on a surface submerged in the culture medium, b) introducing and independently inoculating the culture medium of the containers obtained in step a) with said microorganism at a concentration of from 1×10 -1 to 1×10 -6 McFarland (McF), each medium independently comprising a different concentration of microorganisms, c) maintaining the inoculated culture media in conditions which enable growth of said microorganism, d) applying a field capable of moving said at least two particles resting on a surface submerged in the culture medium, e) determining the biofilm-producing capacity of the microorganism by observing and measuring the aggregation of said particles as follows: - the absence of aggregation of said particles appearing at a concentration of from 1×10 -6 to 1×10 -4 McF corresponding to a strongly biofilm-producing microorganism, - the absence of aggregation of said particles appearing from a concentration of greater than 1×10 -4 and less than 1×10 -2 McF corresponding to a moderately biofilm-producing microorganism, - the absence of aggregation of said particles appearing from a of greater than or equal to 1×10 -2 McF corresponding to a weakly biofilm-producing microorganism, - an aggregation of said particles, regardless of the concentration, corresponding to a non-biofilm-producing microorganism. a) introducing at least two particles into culture containers comprising a liquid culture medium suited to the growth of said microorganism, said particles resting on a surface submerged in the culture medium, b) introducing and independently inoculating the culture medium of the containers obtained in step a) with said microorganism at a concentration of from 1×10 -1 to 1×10 -6 McFarland (McF), each medium independently comprising a different concentration of microorganisms, c) maintaining the inoculated culture media in conditions which enable growth of said microorganism, d) applying a field capable of moving said at least two particles resting on a surface submerged in the culture medium, e) determining the biofilm-producing capacity of the microorganism by observing and measuring the aggregation of said particles as follows: - the absence of aggregation of said particles appearing at a concentration of from 1×10 -6 to 1×10 -4 McF corresponding to a strongly biofilm-producing microorganism, - the absence of aggregation of said particles appearing from a concentration of greater than 1×10 -4 and less than 1×10 -2 McF corresponding to a moderately biofilm-producing microorganism, - the absence of aggregation of said particles appearing from a of greater than or equal to 1×10 -2 McF corresponding to a weakly biofilm-producing microorganism, - an aggregation of said particles, regardless of the concentration, corresponding to a non-biofilm-producing microorganism. - the absence of aggregation of said particles appearing at a concentration of from 1×10 -6 to 1×10 -4 McF corresponding to a strongly biofilm-producing microorganism, - the absence of aggregation of said particles appearing from a concentration of greater than 1×10 -4 and less than 1×10 -2 McF corresponding to a moderately biofilm-producing microorganism, - the absence of aggregation of said particles appearing from a of greater than or equal to 1×10 -2 McF corresponding to a weakly biofilm-producing microorganism, - an aggregation of said particles, regardless of the concentration, corresponding to a non-biofilm-producing microorganism.