We attended the HOU open class held at the "Kitanomaru Science Museum" on November 15, 1997. We enjoyed the CU-SeeMe video conference with Dr. Carl Pennypacker. We consider here the educational effect and problems associated with attending HoU. We think that this open class is a good experience allowing many staff to provide instruction. To set up a class with a lot of people from outside the school is more difficult than to set up a class with one teacher. But it is interesting and effective to set up a class with a lot of people from outside the school. We call this educational system "concerted creation" or "concerted creation class".