Abstract
This paper disaIsses the potential of vidD as a mearn of disrovering young children's expJanatioIl'i of mathematical tasks. This is illustrated with an obsevation made as part of a larger stucY into promoting mathematical processes in New Zealand junior classrooms. It highlights the potential power of vidD as a means of providing the teamer with an insight into the thought processes of young children wing mathematical activities independently of the teacher.