The useful life is defined as the period of time over which an asset is expected to be available for use. In UNDP, the useful lives for various categories have been established based upon UNDP’s practices of retaining assets in use with the intention to seek a reasonable average useful life across all the population of similar assets within UNDP. Therefore some assets may be disposed of prior to reaching their useful life, following a review of their usefulness at their recommended replacement life. Equally, other assets may be retained in service for periods longer than their useful lives, for operational reasons. The number and original cost of assets retained beyond their useful lives will be disclosed in UNDP’s financial statements.