The purpose of this chapter is to assemble results valid in all unequal characteristics. We determine, for example, the decomposition into \(\mathscr{O}\) -blocks as well as the Brauer correspondents. We also introduce modular (that is over \(\mathscr{O}\) , or even over ℤℓ) and structural versions of Harish-Chandra and Deligne-Lusztig induction.