2024 Volume 48 Issue 4 Pages 611-623
In this paper, based on the theme of the special issue, “Teacher Training and In-service Training in the Era of One Device for Student”, we first review the contents of the special issue of about ten years ago on “One-Terminal Per Student” and “Teacher Training and In-service Training”. Then, social changes and changes in the circumstances surrounding schools and teachers in the past ten years are discussed. In addition, we briefly review the research on teacher development and in-service training published in the journal from 2021 to this special issue in 2024. In addition, the paper on the theme of teacher training and in-service training in the age of one terminal per teacher is also reviewed. In pre-service teacher education, we mentioned 1) diversification of learning of students who want to become teachers and 2) diversification of needs in teacher training and recruitment. Also, in in-service teacher education, we mentioned 1) diversification of training styles, programs, and certificates such as face-to-face and online/synchronous and asynchronous and 2) diversification of tools used in training. In the decade ahead, we hope that research that meets society's expectations and works to solve problems will be shared and that research that raises controversies within society and challenges society will be shared while being oriented toward overcoming the challenges of teacher education in our society.