Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TANAKA Kenji,A ‘Soft’ Systems Methodology Utilizing Information Obtained from Systems Failures,Transactions of the Society of Instrument and Control Engineers,04534654,The Society of Instrument and Control Engineers,1990,26,8,908-915,https://cir.nii.ac.jp/crid/1390001204500724736,https://doi.org/10.9746/sicetr1965.26.908