As a member country of the Schengen Agreement, Belgium’s visa application process, particularly for short visits (those less than three months), is straightforward. Schengen visas, regardless of which member country issues them, are valid in 15 countries. Receiving a work permit, however, is much more difficult. In practice, Belgium only issues work permits to highly qualified personnel, executives, researchers, trainees, au pairs and workers in fields where there is a labor shortage in Belgium. Students entering Belgium are permitted to work part-time during the course of their studies and full-time during break periods; a work permit is required for employment while school is in session.

This is just a sample of what you'll find in the complete Belgium guide.