  Searches for the pair production of supersymmetric particles under the
assumption that R-parity is violated via a single dominant LLEbar, LQDbar or
UbarDbarDbar coupling are performed using the data collected by the ALEPH
detector at LEP at centre-of-mass energies from 189 to 209GeV. The numbers of
observed candidate events in the data are in agreement with the Standard Model
expectation, and limits on the production cross sections and on the masses of
charginos, sleptons, squarks and sneutrinos are derived.
