  Re-analysed JADE data were used to determine alpha_S at sqrt{s} = 14-44 GeV
on the basis of resummed calculations for event shapes and hadronisation models
tuned to LEP data. The combined result is alpha_S(M_Z) = 0.1194 +/-
0.0082/0.0068 which is consistent with the world average. Event shapes have
also been used to test power corrections based on an analytical model and to
verify the gauge structure of QCD. The only non-perturbative parameter alpha_0
of the model was measured to alpha_0(2GeV) = 0.503 +/- 0.066/0.045 and is found
to be universal within the total errors.
