Sukuk can be structured in various ways in accordance with the nominated contract which is approved by the Shari'ah and that suits the preference of issuers. Sukuk can accordingly be designed using the agency structure based on the contract of wakalah. The agency contract is selected for the purpose of managing and investing the proceeds generated from the sukuk issuance. This contract is called wakalah bi al-istithmar. For further details see: SUKUK: Principles and Practices.