One of the main benefits of numerical modelling is that it can be used to have access to some features, which are not accessible experimentally. For example, it is quite complicated to determine experimentally the sintering mechanisms that occur during spark plasma sintering (SPS). The obtention of a mechanical model of the SPS is usually done with only one mechanism. However, it has been shown that sometimes more than one mechanism is involved in the densification process as it is the case for TiAl. Thus, an innovative multi-mechanisms approach was developed, which considers the simultaneous effect of two mechanisms on the densification of TiAl. First the two sintering mechanisms of the material were identified numerically. Then, with the method developed in this work, the influence of each mechanism can be decorrelated and interpreted to determine their role during spark plasma sintering. The approach developed here can be applied to any material and shows how numerical modelling can be used to better understand the sintering mechanisms of the SPS.