We read the first section titled "G-structures associated to Hermitian symmetric spaces" of the following paper;
Hwang, Jun-Muk, and Ngaiming Mok. "Rigidity of irreducible Hermitian symmetric spaces of the compact type under Kahler deformation." Inventiones mathematicae 131.2 (1998): 393-418.
We are aiming to discuss what makes easy or hard to deal 'G-structures' in the case of irreducible Hermitian symmetric spaces compare to some other (quasi) homogeneous varieties.