@inproceedings{oai:soar-ir.repo.nii.ac.jp:00020557,
 author = {Morishita, Takeshi and Niimura, Masaaki and Kunimune, Hisayoshi},
 book = {E-Learn 2010-World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education},
 issue = {1},
 month = {Oct},
 note = {This paper is a report on the analysis of papers with keywords about portfolios in the ERIC Collection to make clear the history of educational portfolio research. Portfolios are regarded as an assessment tools for students in college in all years. As a result of the analysis, we have been able to classify portfolio research since 1975 into five stages: predawn, growth, peak, decrease and stabilization. In the early 1990s, portfolios changed greatly, as they went through digitalization, diversification and standardization. In the late 1990s, portfolios were scaled up from individuals to associations and organizations. More recently, an equilibrium has been reached between the appearance frequencies of the keywords “Portfolio Assessment” and “Portfolios (Background Materials)” and portfolios are used in the practical assessment of problem solving., Article, E-Learn 2010-World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education .2010(1):2040-2045(2010)},
 pages = {2040--2045},
 publisher = {Association for the Advancement of Computing in Education (AACE)},
 title = {Historical Characteristics of Education Portfolio Research from Keywords of Research Papers in ERIC},
 volume = {2010},
 year = {2010}
}