  We study the $K$-theory and Swan theory of the group ring $R[G]$, when $G$ is
a finite group and $R$ is any ring or ring spectrum. In this setting, the
well-known assembly map for $K(R[G])$ has a companion called the coassembly
map. We prove that their composite is the equivariant norm of $K(R)$. This
gives a splitting of both assembly and coassembly after $K(n)$-localization, a
new map between Whitehead torsion and Tate cohomology, and a partial
computation of $K$-theory of representations in the category of spectra.
