IMPROVED QEDPS FOR RADIATIVE-CORRECTIONS IN E(-) ANNIHILATION()E()

The generator QEDPS, a parton shower model in QED, developed by the pr esent authors has been improved. By a careful study on the shower algo rithm, it was found that some finite contributions have been missed in the original version. They are small, but cannot be neglected when th e contribution of the soft photons is dominant. A method is presented to correct these finite pieces and then a new generator, improved QEDP S, is proposed, which is able to make more precise prediction for the processes observed in e(+)e(-) annihilation as far as the initial radi ation is concerned.