I like a lot the idea about knowledge construction during early childhood. I think -as many authors do- that in early childhood is very important to build and articulate right knowledge based on strong concepts. Usually not accurate pre-school education can give kids wrong concepts about different subject matters and leading them to misconceptions about ceratin things. If children do not have during their first years of life a good education, they will miss several opportunities of learning and are prone to articulate in wrong ways different concepts.