This thesis, consisting of three papers and a summary, studies properties of stratified algebras and representations of Lie super algebras.In Paper I we give a characterization when the Ringel dual of an SSS-algebra is properly stratified.We show that for an SSS-algebra, whose Ringel dual is properly stratified, there is a (generalized) tilting module which allows one to compute the finitistic dimension of the SSS-algebra, and moreover, it gives rise to a new covariant Ringel-type duality.