\bottomheading{$WZ$ with interference, processes 711 and 761} This process can be calculated at LO, NLO, and NNLO. NLO calculations can be performed by subtraction, zero-jettiness slicing and $q_T$-slicing. NNLO calculations can be performed by zero-jettiness slicing and $q_T$-slicing. Full account is taken in this process of the interference between diagrams generated by the exchange of two positrons. This leads to a more complicated resonance structure in the phase space.