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Table 4 The most used scientific methods

From: A bibliometric study on “education for sustainability”

Curriculum analysis or evaluation 62.24 %
Case study 21.09 %
Survey 13.27 %
Interview 10.88 %
Action research 10.20 %
Qualitative research 8.84 %
Delphi method 4.42 %
Content analysis 3.06 %
  1. An article may use more than one method