Children should practice authentic science in a community. This paper discusses constructing a community in the school laboratory and doing scientific experiments. Using the Kneading Board and synchronous CSCL experiment groups are intimately related. We confirmed that having the participants relate to each other becomes a resource and a setting of measurement standards in the whole class. So the whole class became a big community. And we confirmed that using such a method involves competition between experiment groups, securing of reliability, critical examination, making criteria, and usi...