A study by researchers at the University of Ulster has found that more teachers in Northern Ireland than ever before are working across the sectarian divide, with teachers from Catholic communities working in Protestant schools and vice versa. This is especially the case for those working in post-primary schools (age 11+).
source https://www.lifetechnology.com/blogs/life-technology-science-news/growing-minority-of-teachers-in-northern-ireland-working-across-sectarian-divide