This mixed-methods study aims to explore the assessment strategies and tools teachers use to assess student learning in Virtual exchange (VE) in foreign/second language for specific purposes (FLSP) courses at tertiary level. The quantitative data were collected by means of a purpose-designed questionnaire that focused on assessment tools teachers used in order to give feedback to students involved in a VE project. The questionnaire data was supplemented with oral interviews with language teachers from diverse cultural backgrounds and aimed at eliciting more in-depth information about the planning of the assessment process, the form of assessment (e.g. summative or formative) and feedback provision. The results indicate that the teachers tend to perceive assessment as a formative process and apply assessment tools that focus on both content and language components, and encourage reflective practice and collaboration.