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66GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIESNOTES TO THE CONSOLIDATED FINANCIAL STATEMENTSFOR THE YEAR ENDED 31 DECEMBER 20152. Signifcant accounting policies (continued)xxviii) Comparative informationConsolidated statement of cash fowsThe Group has amended its presentation of unrealised loss/gain on revaluation of investment securities within the consolidated statement of cash fows to refect movements related only to securities held for investment purposes as opposed to securities of a short-term deposit nature. The Group has also amended its presentation of the net interest income and movement in trade and other receivables in the consolidated statement of cash fows for the 2014 comparative to be consistent with its current presentation in 2015. 3. Signifcant accounting estimates, assumptions and judgmentsThe preparation of the fnancial statements in conformity with IFRS necessitates the use of estimates, assumptions and judgments. These estimates and assumptions affect the reported amounts of assets and liabilities and contingent liabilities at year end as well as affecting the reported income and expenses for the year.Although the estimates are based on management%u2019s best knowledge and judgment of current facts as at year end, the actual outcome may differ from these estimates, possibly signifcantly.The key assumptions concerning the future and other key sources of estimation uncertainty at year end, that have a signifcant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next fnancial year are discussed beloImpairment of goodwill and intangible assets with indefnite livesThe Group determines whether goodwill or other intangible assets are impaired at least on an annual basis. This requires an estimation of the %u2018value in use%u2019 of the cash generating units to which the goodwill is allocated. Estimating a value in use amount requires management to make an estimate of the expected future cash fows from the cash generating units and also to choose a suitable discount rate in order to calculate the present value of those cash fows.(Expressed in Thousands of Trinidad and Tobago Dollars, except where otherwise stated)(Continued)