The POWHEG BOX is a framework for building generators interfaced to shower Monte Carlo that include next-to-leading corrections to the basic hard process. I will discuss recent progress in this framework, with particular attention to a newly proposed procedure (dubbed MiNLO, for Multiscale improved Next-to-Leading Order) for the choice of the factorization and renormalization scales in NLO calculations. This procedure is particularly suited for processes involving several, widely different scales due to associated jet production, and it is most useful in the framework of the POWHEG method. I will discuss the MiNLO improved POWHEG generators for processes like Higgs, W or Z production with up to two associated jets.
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