  We present a Kolmogorov-like algorithm for the computation of a normal form
in the neighborhood of an invariant torus in `isochronous' Hamiltonian systems,
i.e., systems with Hamiltonians of the form
$\mathcal{H}=\mathcal{H}_0+\varepsilon \mathcal{H}_1$ where $\mathcal{H}_0$ is
the Hamiltonian of $N$ linear oscillators, and $\mathcal{H}_1$ is expandable as
a polynomial series in the oscillators' canonical variables. This method can be
regarded as a normal form analogue of a corresponding Lindstedt method for
coupled oscillators. We comment on the possible use of the Lindstedt method
itself under two distinct schemes, i.e., one producing series analogous to
those of the Birkhoff normal form scheme, and another, analogous to the
Kolomogorov normal form scheme in which we fix in advance the frequency of the
torus.
