- 2020 - 2023 The issues of educational and developmental support for children of international marriage homes
- 2018 - 2023 幼児期の認知発達にふさわしい教育とは:子どもが「遊び」の中で学んでいること
- 2012 - 2015 A developmental study of children's logical and intuitive thinking: The relationship between numerical concepts and cognition of imaginary world.
- 2009 - 2011 Development of numerical concepts observed in children's utterances in kindergartens and elementary schools and its relationship to mathematical education
- 2006 - 2009 An investigation on the curriculum and teaching plans that would guarantee the process of learning suitable for preschoolers
- 2006 - 2008 Numeracy observed in children's play and its relationship to cognitive development on equal distribution
- 2004 - 2006 A comprehensive study on the embodiment in understanding of number
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