Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) WATANABE Natsuk and YAMAMOTO Ryota and KONNO Takayuki and KUBOTA Kenichi,The Process of Trial and Error by a Teacher who Designed a Child-centered Classes at Integrated Studies in Elementary School,Japan Journal of Educational Technology,1349-8290,Japan Society for Educational Technology,2020-02-20,43,Suppl.,141-144,https://cir.nii.ac.jp/crid/1390002184884984192,https://doi.org/10.15077/jjet.s43085