In Islamic finance, a practice in which one party agrees to produce specific goods and services made according to certain agreed specifications and price for delivery on a certain date. The production of the goods includes any process of manufacturing, construction, assembling, or packaging. The work may be done by others. Istisna'a may also be used in preshipment financing of the acquisition of capital goods and to finance intangible goods such as gas and electricity. See also alternative finance arrangements.