In the Master programme Biobased Sciences of WUR, boundary crossing is operationalised as a parallel course (i.e., ‘lintvak’) that runs throughout the whole programme, parallel to other courses. Using assignments and reflections developed in several courses, students reflect on the boundary crossing skills and development. These reflections are collected in a portfolio and finalised with an assessment interview afterwards. Rubrics to assess the BC reflection reports as well as the BC assessment interview are included.