Sartoretti, Guillaume AdrienHongler, Max-Olivier2014-01-082014-01-082014-01-08201410.1007/978-3-642-53856-8_6https://infoscience.epfl.ch/handle/20.500.14299/99038This contribution is addressed to the dynamics of heterogeneous interacting agents evolving on the plane. Heterogeneity is due to the presence of an unfiltered externally controllable fellow, a shill, which via mutual interactions ultimately drives (i.e. soft controls) the whole society towards a given goal. We are able to calculate relevant dynamic characteristics of this controllable agent. This opens the possibility to optimize the soft controlling of a whole society by infiltrating it with a properly designed shill. Numerical results fully corroborate our theoretical findings.homogeneous and heterogeneous Brownian agentslimited range mutual interactionssoft controlmixed canonical-dissipative dynamicsmean-field descriptionanalytical resultstext::book/monograph::book part or chapter