Conference Program

The “impact” of teacher professional development is often considered a linear process linking professional learning to changes in teachers’ knowledge and practices, and to student outcomes. While policy and evaluation frameworks frequently rely on this conception of "impact", this approach can oversimplify professional learning as a stable input–output mechanism and underestimate the role of design, mediation, and context. This contribution critically revisits impact in professional development by focusing on a neglected but fundamental aspect: the pedagogical architecture of the learning environment in which teachers enact innovation.

We draw on a national eTwinning mixed-methods study carried out across 14 Italian secondary schools, where each implementation context included two matched classes taught by the same teacher in the same subject (eTwinning vs. control). In this context, we focus on the teacher and project layer to explore how “impact” may operate through a structured project scaffold. Using a dedicated project-analysis protocol applied to Quality Label-awarded eTwinning projects, we characterised pedagogical quality along multiple dimensions (such as authenticity of joint tasks, intensity of international collaboration, epistemic use of technology, student agency, and curricular integration). In our research, these qualitative descriptors were triangulated with implementation evidence from teachers’ monthly logbooks, cross-case patterns at school level, and quantitative evidences extracted from the analysis of pre-post students' self-evaluation questionnaires and pre-post teachers' evaluations.

A key pattern emerges: even within a sample of highly experienced teachers - eTwinning ambassadors with strong professional profiles - project quality varies substantially and aligns with systematic differences in implementation density, visibility of competence-related episodes, and the coherence of the learning workflow. The findings suggest that impact in teacher professional development cannot be exclusively reduced to teachers’ baseline expertise. Rather, the eTwinning ecosystem functions as a powerful accelerator and scaffold structure: it provides a pre-architected framework that supports teachers in designing collaborative routines, generating observable evidence of learning processes, and sustaining reflective cycles of planning, documentation, and iterative improvement. In this sense, “impact” appears as an emergent property of a learning ecosystem in which professional competence is surely relevant, but structured design and shared quality criteria strongly condition what can be enacted in practice, documented as evidence, and transferred across contexts.