The QCT outcome, which is formed basically by Cartesian coordinates and momenta at the end of each reactive trajectory, permits us to directly obtain a series of dynamical properties: vibrational and rotational energies of the HCN and C2H5 products, E vib HCN, E rot HCN, E vib C2H5 and E rot C2H5; the scattering angle  between the HCN product and the incident CN radical, and the relative translational energy, Etrans, between HCN and C2H5. However, the a1-a3 actions for the HCN(v1,v2,v3) product, one of the main aims of the present paper, are not directly obtained from the QCT outcome; they were calculated using the normal mode analysis method developed in our group, NMA method. These actions correspond to CN stretching (ν1 = 2046 cm -1 ), bending (ν2 = 723 cm -1 , doubly degenerate) and CH stretching (ν3 = 3527 cm -1 ), respectively. The actions are real numbers and were rounded to their nearest integer, n1-n3, which corresponds to the standard binning approach, SB, i.e., each reactive trajectory contributes to the final result with weight unity. More sophisticated alternatives have been proposed, which carry a higher computational cost: in the Gaussian binning approach, GB, each reactive trajectory is weighted by a Gaussian function, so that the larger the weight the closer the action to an integer number. This approach is computationally very demanding, and the energy-based Gaussian binning approach, 1GB, is an economic alternative, where the total vibrational energy of each product is quantized. These last two approaches (or a purely quantum treatment, when this is possible) are affordable and realistic when few product vibrational states are populated; however, this is not the case for the HCN(v1,v2,v3) product in the title reaction, where many vibrational states are populated with low individual population (see below in Results), and in these conditions the SB approach is advisable. This good behaviour was found in previous studies for the CN + CH4  HCN(v1,v2,v3) + CH3 reaction and for the OH + CO → H + CO2(v1,v2,v3) reaction, where the CO2 product also presented a large number of populated vibrational states, and where the SB and the more expensive 1GB approaches gave similar populations. A different picture was found when few vibrational states were populated. This is the case of the OH + D2 → HOD(v1,v2,v3) + D reaction, where the 1GB approach improved the agreement with experiment.