This research project verified the effect of an evaluation method that made use of a digital portfolio in recording the experiment in which sixth graders in elementary school examine the "working of the electromagnet." As a result, the following three points were made clear.・The learner's interaction is promoted by the evaluation scene.・Learning by the exchange of mutual evaluation can be an effective tool to organize the experiment record clearly.・The time necessary for instruction is reduced, so the teacher can use more time for evaluation by using a digital portfolio in the discussion ac...