@inproceedings { leite09, abstract = {Given the recent advances in robot and synthetic character technology, many researchers are now focused on ways of establishing social relations between these agents and humans over long periods of time. Early studies have shown that the novelty effect of robots and agents quickly wears out and that people change their attitudes and preferences towards them over time. In this paper, we study the role of social presence in long-term human-robot interactions. We conducted a study where children played chess exercises with a social robot over a five week period. With this experiment, we identified possible key issues that should be considered when designing social robots for long-term interactions.}, booktitle = {Proceedings of the 18th IEEE International Symposium on Robotics - RO-MAN 2009}, keywords = {Social Robotic Companions;}, pages = {669-674}, publisher = {IEEE Computer Society}, title = {As Time goes by: Long-term evaluation of social presence in robotic companions}, year = {2009}, author = {Iolanda Leite and Carlos Martinho and André Pereira and Ana Paiva} }