If
(
X
,
d
)
(X, d)
is a complete metric space and
T
:
X
→
X
T : X \to X
is a contraction mapping, then the conclusion of the Banach-Caccioppoli contraction principle is that the sequence of successive approximations of
T
T
starting from any point of the space converges to a unique fixed point. In this paper, we obtain a sufficient and necessary condition of the above conclusion in terms of the so-called strong Leader mappings.