Heavy flavours forward-backward asymmetries at LEP

The four LEP experiments have measured the forward-backward asymmetry for the processes e(+)e(-)-->Z-->b (b) over bar and e(+)e(-)-->Z-->c (c) over bar with very high precision. The various and very sophisticated methods providing largely independent determinations of A(FB)(b) and A(FB)(c) are briefly presented. The results yield a very precise determination of the electroweak effective mixing angle sin(2)theta(eff)(lept), probing the Standard Model prediction for the electroweak radiative corrections. LEP measurements of AFB and their interpretation are also presented at centre-of-mass energies above the Z resonance.