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Revenue from contracts for the provision of professional services is recognised by reference to the
stage of completion when the stage of completion, costs incurred and costs to complete can be
estimated reliably. The stage of completion is calculated by comparing costs incurred, mainly in
relation to contractual hourly staff rates and materials, as a proportion of total costs. Where the
outcome cannot be estimated reliably, revenue is recognised only to the extent of the expenses
recognised that it is probable will be recovered.
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