The more dense oceanic crust ... You certainly mean the oceanic lithosphere...
...lithospheric mantel ...: You certainly mean lithospheric mantle
Side push is not synonimous to Ridge Push.
Basal traction is not synonimous to Slab Pull. The traction of a force is the ratio between the force to the surface on which it is applied, the traction describe therefore the intensity of the force. The basal traction describes the component of the traction parallel to the surface (also called shear traction).
Ridge Push: can be simply described as the sliding of the oceanic lithosphere away from the high standing MOR.
Slab Pull: it is the density inversion (dense slab in less dense asthenosphere) that is reponsible for the slab pull.
This subduction occurs because the oceanic crust is more dense then the continental crust. This subduction occurs because the oceanic lithosphere is more dense then the asthenosphere.
How much deformation in the continental crust occurs is defendant on the dip of the subducting plate. Not only how much but also the style of deformation (extension, contraction)
II.2.2 this is the core of the project. It could have been expanded a bit.
III.
An introduction to this section would have been welcome.
Fig. 3.1 shows the orientation of the sigma 1 the principal stress axis.
The concept of pure shear is not scale dependent. It seems that you are confused about the terminology.
IV
Ok except that in figure 4.4 the gravitational force does not drive convergence, it opposes it. Slab Pull is not a gravitational force.