The following preprint is available. It is about my talk at Cape Town, CT2009. Best regards Marco Grandis ------- M. Grandis, Homotopy spectral sequences, Dip. Mat. Univ. Genova, Preprint 570 (2009). http://www.dima.unige.it/~grandis/HtSp.pdf Abstract. In homotopy theory, exact sequences and spectral sequences consist of groups and pointed sets, linked by actions. We prove that the theory of such exact and spectral sequences can be established in a categorical setting which is based on the existence of kernels and cokernels with respect to an assigned ideal of null morphisms, a generalisation of abelian categories and Puppe-exact categories. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]