  Long-term memory is essential to feel like a continuous being, and to be able
to interact/communicate coherently. Social robots need long-term memories in
order to establish long-term relationships with humans and other robots, and do
not act just for the moment. In this paper this challenge is highlighted, open
questions are identified, the need of addressing this challenge in the
RoboCup@Home League with new tests is motivated, and a new test is proposed.
