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Notes to the Financial StatementsFOR THE FINANCIAL YEAR ENDED 31 DECEMBER 20094. SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)(c)Property, plant and equipment (continued)(ii) Depreciation and residual valueFreehold land is not depreciated as it has an infinite life. Other property, plant and equipment are depreciatedon a straight line basis to write off the cost of the assets to their residual values over their estimated usefullives in years as summarised below:BuildingsTelecommunication network equipmentMovable plant and equipmentComputer support systems5 – 50 years3 – 20 years5 – 8 years3 – 5 yearsDepreciation on assets under construction or capital work-in-progress commence when the assets are readyfor their intended use. Depreciation on property, plant and equipment ceases at the earlier of derecognitionand classification as held for sale.The assets’ residual values and useful lives are reviewed and adjusted as appropriate at each balance sheetdate.(iii)ImpairmentAt each balance sheet date, the Group assesses whether there is any indication of impairment. If suchindication exists, an analysis is performed to assess whether the carrying value of the asset is fully recoverable.A write down is made if the carrying value exceeds the recoverable amount (see significant accountingpolicies Note 4(f) on impairment of non-financial assets).(iv) Gains or losses on disposalGains or losses on disposal are determined by comparing the proceeds with the carrying amount of therelated asset and are included in the Income Statement.(v)Asset exchange transactionProperty, plant and equipment may be acquired in exchange for a non-monetary asset or for a combinationof monetary and non-monetary assets and is measured at fair value unless:• the exchange transaction lacks commercial substance; or• the fair value of neither the assets received nor the assets given up can be measured reliably.The acquired item is measured in this way even if the Group cannot immediately derecognise the assets givenup. If the acquired item cannot be reliably measured at fair value, its cost is measured at the carrying amountof the asset given up.Axiata Group Berhad • 182