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From 2010, Social Science Japan Data Archive started to introduce DDI and also develop Easy DDI Organizer (EDO). EDO is a tool which helps researchers to conduct social surveys and manage their metadata. It enables researchers to record survey metadata along with data lifecycle such as study purpose, sampling procedure, mode of data collection, questions, question sequence, variable descriptions, and bibliographic information. It also supports importing variable level metadata from SPSS filesdoi:10.5281/zenodo.3781229 fatcat:b3somuerlvg6rjpvqhk2ukrdpa