 The underlying assumption behind this was that it is not important for them to memorise all the content but to develop certain skills and understand certain key concepts necessary to make a foundation so that they can understand the world around them.Activity-based science curricula were first tried out in the US and UK, hence a lot of studies were carried out there to understand how children learn.An important finding that came out of this was children do not unquestioningly imbibe the lessons in the Science class-room, they process all the new information on the basis of what ideas they have already learnt.