This study delves into immersion competencies within secondary education, specifically focusing on transformative
professional development in Home Economics pedagogical integration. Specifically, this paper investigates how six teacher
participants, in the Gaeltacht education context in Ireland, acquired the necessary competencies for meaningful
language integration, as outlined by the IPACK framework. In addition, the role of a bespoke professional development programme in
fostering such competencies was examined. Through qualitative action research design, data collection tools such as classroom
observations, stimulated recall interviews, questionnaires, and reflective diaries were employed. Findings demonstrated evident
evolvement of participants’ pedagogical approach of Form-Focused Instruction and contributed to understanding the intricacies of
immersion competencies at secondary level, highlighting their interdependence as a prerequisite for effective pedagogical
integration. Implications suggest the need for targeted professional development initiatives to empower teachers with the
competencies necessary for effective integration of content and language pedagogies.