... through the interconnected ideas of “became, being and becoming”. Findings The editorial argues that koshi should not be understood merely as outside experts or knowledgeable others who advise teachers. Instead, the studies in this special issue portray koshi as professionals who learn through ongoing...

...Jongsung Kim; Hiromi Kawaguchi; Nariakira Yoshida Purpose This study explores how koshi, knowledgeable others in Japanese lesson study, learn to support teacher learning by examining their own facilitation practices. Although koshi play a key role in sustaining lesson study, relatively little...

...David Sekao Purpose Lesson study (LS) is a collaborative teacher development practice, and one of the key attributes thereof is the involvement of the external knowledgeable other (koshi). Despite well-documented evidence that LS improves the craft of teaching, the entrenched concept...

... Knowledgeable other Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. EFL teachers play significant roles in developing students’ language proficiency, and they are the chief of the overall instructional...