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The Standard Economic Sector Classifications of Australia (SESCA) present a system for classifying institutional units (such as enterprises and households) into appropriate sectors of the economy. A major component of the SESCA is the Standard Institutional Sector Classification of Australia (SISCA) which forms the basis for the institutional sectoring of a range of statistics in the ABS, including the National Accounts, Balance of Payments, International Investment, Financial Accounts and Government Finance Statistics.

SISCA is often used in conjunction with a number of other supporting classifications such as Public/Private classification, Level of Government classification, Jurisdiction classification and the Type of Legal Organisation classification (TOLO). This group of classifications and other related classifications are together presented as the SESCA. These associated classifications allow further identification and detail of particular characteristics of institutional units classified under the SISCA.