  Zassenhaus conjectured that any unit of finite order in the integral group
ring $\mathbb{Z}G$ of a finite group $G$ is conjugate in the rational group
algebra of $G$ to an element in $\pm G$. We review the known weaker versions of
this conjecture and introduce a new condition, on the partial augmentations of
the powers of a unit of finite order in $\mathbb{Z}G$, which is weaker than the
Zassenhaus Conjecture but stronger than its other weaker versions.
  We prove that this condition is satisfied for units mapping to the identity
modulo a nilpotent normal subgroup of $G$. Moreover, we show that if the
condition holds then the HeLP Method adopts a more friendly form and use this
to prove the Zassenhaus Conjecture for a special class of groups.
