Covers -- Reinvestigating the theory and practice gap in Participatory Educational Research -- Quality criteria for lesson and learning studies as forms of action research -- The knowledge machinery and claims in learning study as paedeutical research -- Preservice EFL teachers' collaborative understanding of lesson study -- Scripting the experience of mathematics teaching -- Are lesson study participants sharing their professional knowledge? -- A research environment for teacher-driven research - some demands and possibilities -- Mechanisms enabling knowledge production in learning study.