NBBU is the sector organisation for temporary job agencies. It was founded in 1994 and represents the interests of more than 800 agencies and their temporary workers. The Collective Labour Agreement for Temporary Workers states the rules and regulations all NBBU members must comply with. BWB Flex undergoes an annual audit by an independent institution to verify proper compliance. A positive outcome is a condition for continued NBBU membership.
Also read https://www.nbbu.nl/lid/bwb-flex-bv