This paper presents a new method to consistently combine next-to-leading order (NLO) parton-level calculations with parton showers, avoiding double counting and preserving both the fixed-order accuracy of the parton-level result and the logarithmic accuracy of the parton shower. The method, called MEPS@NLO, uses a modified truncated shower scheme to ensure that the parton shower accurately describes the kinematics of multi-jet final states. The approach is implemented in the SHERPA event generator and is tested using the example of W-boson production at the Large Hadron Collider (LHC). The results show a significant reduction in theoretical uncertainties compared to existing methods, demonstrating the predictive power of the new technique. The method is based on the combination of NLO matrix elements with parton showers, using a truncated vetoed parton evolution to maintain the logarithmic accuracy of the shower. The approach is validated by comparing predictions with experimental data from the ATLAS collaboration, showing good agreement in various observables such as jet multiplicity, transverse momentum, and angular correlations. The method also reduces the dependence on the renormalisation and factorisation scales, leading to a more accurate description of data. The results demonstrate that the new technique provides a more reliable and precise description of multi-jet events in high-energy collisions.This paper presents a new method to consistently combine next-to-leading order (NLO) parton-level calculations with parton showers, avoiding double counting and preserving both the fixed-order accuracy of the parton-level result and the logarithmic accuracy of the parton shower. The method, called MEPS@NLO, uses a modified truncated shower scheme to ensure that the parton shower accurately describes the kinematics of multi-jet final states. The approach is implemented in the SHERPA event generator and is tested using the example of W-boson production at the Large Hadron Collider (LHC). The results show a significant reduction in theoretical uncertainties compared to existing methods, demonstrating the predictive power of the new technique. The method is based on the combination of NLO matrix elements with parton showers, using a truncated vetoed parton evolution to maintain the logarithmic accuracy of the shower. The approach is validated by comparing predictions with experimental data from the ATLAS collaboration, showing good agreement in various observables such as jet multiplicity, transverse momentum, and angular correlations. The method also reduces the dependence on the renormalisation and factorisation scales, leading to a more accurate description of data. The results demonstrate that the new technique provides a more reliable and precise description of multi-jet events in high-energy collisions.