  Toen has interpreted the schematization problem as originally imagined by
Grothendieck in "Pursuing Stacks" in such a way that solution(s) to this
problem could be given. As he pointed out, there are many solutions available,
and he gave two constructions solving this problem. What we do in the present
work is reconsider what Grothendieck initially had in mind and develop a
formalism that provides a concept of "schematization" and corresponding
homotopy groups of "schematized" homotopy types. In our view this can be
realized if we generalize topological spaces to symmetric spectra, and the
mapping spaces Map(S,A) in the category of symmetric sequences play the role of
homotopy groups, S the sphere spectrum, A a symmetric spectrum.
