  We study Non-autonomous Iterated Function Systems (NIFSs) with overlaps. A
NIFS on a compact subset $X\subset\mathbb{R}^m$ is a sequence
$\Phi=(\{\phi^{(j)}_{i}\}_{i\in I^{(j)}})_{j=1}^{\infty}$ of collections of
uniformly contracting maps $\phi^{(j)}_{i}: X\rightarrow X$, where $I^{(j)}$ is
a finite set. In comparison to usual iterated function systems, we allow the
contractions $\phi^{(j)}_{i}$ applied at each step $j$ to depend on $j$. In
this paper, we focus on a family of parameterized NIFSs on $\mathbb{R}^m$.
Here, we do not assume the open set condition. We show that if a $d-$parameter
family of such systems satisfies the transversality condition, then for almost
every parameter value the Hausdorff dimension of the limit set is the minimum
of $m$ and the Bowen dimension. Moreover, we give an example of a family
$\{\Phi_t\}_{t\in U}$ of parameterized NIFSs such that $\{\Phi_t\}_{t\in U}$
satisfies the transversality condition but $\Phi_t$ does not satisfy the open
set condition for any $t\in U$.
