This presentation reports preliminary findings arising from a research project, which embodied cross-disciplinary collaboration into the teaching and learning of Mathematics. The project involved the use of a form of Japanese lesson study by colleagues from the Education Department and the Mathematics Department of a College of Education and Humanities in the Republic of Ireland. Five colleagues worked together to explore the goals of teaching two research lessons; the first of which was part of a module in the history of mathematics for BA students, and the second, a lesson in mathematics education for BEd (Primary) students. Following ethical clearance, the research lessons were videotaped using both a static camcorder focused on the teacher and a roving camera to record student participation. The research lessons were also observed in situ by the remaining participants of the lesson study group. Both research lessons were later transcribed. In this presentation we will report on our initial findings from the different perspectives of preparing, teaching, observing and reviewing the first research lesson. The potential for conducting lesson study in a cross-disciplinary fashion will be discussed.