By using a recent theorem of Davison and Kunze [1], it is shown that, if certain conditions hold such that the system

is globally controllable, then the perturbed system
![\\dot{x} = [A(x,t) + \\epsilon\\tilde{A}(x,t)]x + [B(x,t) + \\epsilon\\tilde{B}(x,t)u](/images/tex/3690.gif)
, where

and

are bounded, is also globally controllable, provided ε is small enough. In particular, if

is controllable, then so is the perturbed system
![\\dot{x} = [A(t) + \\epsilon\\tilde{A}(x,t)]x + [B(t) + \\epsilon\\tilde{B}(x,t)]u](/images/tex/3694.gif)
.