If the place of the contract’s performance is Switzerland, the supplier is required to comply with local regulations on the protection of workers, working conditions and on equal pay for men and women. If the place of performance is abroad, the bidder needs to comply with at least the eight International Labour Organisation’s Core Conventions. In addition, the contracting authority may require compliance with other important international labour standards, in the form of principles derived from other ILO conventions provided Switzerland has ratified them.