Searches for the production of supersymmetric particles under the assumptio
n that R-parity is violated via a single dominant LLE, LQD or UDD coupling
were performed. These use the data collected by the ALEPH detector at LEP a
t centre-of-mass energies from 188.6 to 201.6 GeV. The numbers of candidate
events observed in the data are consistent with Standard Model expectation
s. Upper limits on the production cross sections and lower limits on the ma
sses of charginos, sleptons, squarks and sneutrinos are derived.