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2. Signifcant accounting policies (continued)viii) Financial assets and liabilities (continued)Debt instruments measured at fair value through OCIThe ECLs for debt instruments measured at FVOCI do not reduce the carrying amount of these fnancial assets in the statement of fnancial position, which remains at fair value. Instead, an amount equal to the allowance that would arise if the assets were measured at amortised cost is recognised in OCI as an accumulated impairment amount, with a corresponding charge to proft or loss. The accumulated loss recognised in OCI is recycled to the proft and loss upon derecognition of the assets.Forward looking informationIn its ECL models, the Group relies on a broad range of forward-looking information as economic inputs, such as:%u2022 GDP growth%u2022 Unemployment rates%u2022 Central Bank base rates%u2022 House price indicesThe inputs and models used for calculating ECLs may not always capture all characteristics of the market at the date of the fnancial statements. To refect this, qualitative adjustments or overlays are occasionally made as temporary adjustments when such diferences are signifcantly material.Write-ofsFinancial assets are written of either partially or in their entirety only when the Group has stopped pursuing the recovery. If the amount to be written of is greater than the accumulated loss allowance, the diference is frst treated as an addition to the allowance that is then applied against the gross carrying amount. Any subsequent recoveries are credited to credit loss expense.GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIES NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTSFOR THE YEAR ENDED 31 DECEMBER 2018(Expressed in Thousands of Trinidad and Tobago Dollars, except where otherwise stated)(Continued)60 GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIES ANNUAL REPORT 2018