Revenues - Inflows or other enhancements of assets of an entity or settlements of its liabilities during a period from delivering or producing goods, rendering services, or other activities that constitute the entity's ongoing major or central operations.

Expenses - Outflows or other using-up of assets or incurrences of liabilities during a period from delivering or producing goods, rendering services, or carrying out other activities that constitue the entity's ongoing major or central operations.

Gains - Increases in equity (net assets) from peripheral or incidental transactions of an entity except those that result from revenues or investments by owners.