Predictions are made for single-spin azimuthal asymmetries (SSA) due to the Collins effect in pion production from semi-inclusive deep-inelastic scattering off transversely and longitudinally polarized targets for the HERMES and COMPASS experiments. The SSA A_UT from the transversely polarized proton target are found to be about 20% for positive and neutral pions both at HERMES and COMPASS. For a longitudinally polarized target for COMPASS A_UL^sinf ~ 1% and A_UL^sin2f ~ 3%.

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