1) Converting accounting systems to IFRS requires extensive planning and involvement from IT, which represents 50-70% of conversion costs.
2) European companies underestimated the impact on IT systems, so conversion requires changes to things like general ledger design, inventory systems, asset valuation, and reporting data warehouses.
3) Proper project management is key, including establishing an IT steering committee, training accounting and IT staff, and testing any system changes to internal controls over financial reporting.