  A new method to construct event-generators based on next-to-leading order QCD
matrix-elements and leading-logarithmic parton showers is proposed. Matrix
elements of loop diagrams as well as those of a tree level can be generated
using an automatic system. A soft/collinear singularity is treated using a
leading-log subtraction method. Higher order re-summation of the soft/collinear
correction by the parton shower method is combined with the NLO matrix-element
without any double-counting in this method.
