Article 14 of the ADB Charter states ADB's operating principles. Those relating to procurement are

• Source of Procurement
  Proceeds of a loan can be used only for procurement of goods and works supplied from, and produced in, member countries of ADB.
   
• Economy and Efficiency
  To achieve economy and efficiency, contracts are to be procured through international competition unless other forms of procurement are more suitable and have been agreed upon between ADB and the borrower.
   
• Fairness
  Procurement procedures must give member countries adequate, fair, and equal opportunity to compete for contracts.
   
• Transparency
  Transparency is essential in the procurement process to achieve economy and efficiency and to combat fraud and corruption.