(a) asset-based Sukuk, where the underlying assets offer fairly predictable returns to the Sukuk holders, such as in the case of Salam, Istisna'a and Ijarah (Note: the assets in question may be held by a Musharakah or Mudarabah which is securitised. This is not the same as the Musharakah or Mudarabah Sukuk mentioned below).

(b) equity-based Sukuk, where the returns are determined on a profit and loss sharing in the underlying investment which does not offer fairly predictable returns (e.g. Musharakah or Mudarabah for trading purposes).