describe them in your ouwn words.

as a long parragraph

Revenue Recognition Sales revenue is recognized at the time of product shipment or delivery, depending on when control passes, to unaffiliated customers, and when all of the following have occurred: a firm sales agreement is in place, pricing is fixed or determinable, and collection is reasonably assured. Sales are reported net of returns, consumer and trade promotions, rebates and freight allowed. Taxes imposed by governmental authorities on our revenue-producing activities with customers, such as sales taxes and value-added taxes, are excluded from net sales. Property and Depreciation Property, plant and equipment are stated at cost and are depreciated on the straight-line method. Buildings are depreciated over their estimated useful lives, primarily 40 years. Machinery and equipment are depreciated over their estimated useful lives, primarily ranging from 16 to 20 years. Purchases of computer software, including external costs and certain internal costs roll-related costs of employees) directly associated with developing significant computer software applications for internal use, are capitalized. Computer software costs are amortized on the straight-line method over the estimated useful life of the software, which generally does not exceed 5 years. Estimated useful lives are periodically reviewed and, when warranted, changes are made to them. Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. An impairment loss would be indicated when estimated undiscounted future cash flows from the use and eventual disposition of an asset group, which are identifiable and largely independent of the cash flows of other asset groups, are less than the carrying amount of the asset group. Measurement of an impairment loss would be based on the excess of the carrying amount of the asset group over its fair value. Fair value is measured using discounted cash flows or independent appraisals, as appropriate. When property is sold or retired, the cost of the property and the related accumulated depreciation are removed from the consolidated balance sheet and any gain or loss on the transaction is included in income