  Three recent OPAL studies are presented in which the fragmentation process in
quark and gluon jets and in identified up, down and strange flavour jets is
studied. The first is a measurement of charged particle, pi0, eta and K0
multiplicities in quark and gluon jets. No evidence is found for a
particle-species dependent multiplicity enhancement in gluon jets. In another
study leading pion, kaon, K0, proton and lambda rates have been measured in up,
down and strange flavour jets. The results confirm the leading particle effect
in the fragmentation of light flavour jets. In addition, a direct determination
of the strangeness suppression factor has been performed, yielding
gamma_s=0.422 +/- 0.049(stat.) +/- 0.059(syst.). In a third study, mean charged
particle multiplicities were measured for up, down and strange flavoured Z0
decays and found to be identical within the uncertainties of the measurement,
as expected from the flavour independence of the strong interaction.
