Two mobile robots, i.e., Pioneer-AT and PowerBot, were
used in our experiments as the platforms to train the children.
Both robots are manufactured by Adept. Pioneer-AT
(see Fig. 1, left) was used in the short-term pilot study, and
PowerBot (see Fig. 1, right) in the long-term pilot study. An
off-the-shelf booster seat with safety strips was attached to
the top of both mobile robots.