Hedge effectiveness measurement is the assessment of how well a hedging instrument offsets the risk associated with a hedged item, particularly in the context of foreign exchange risk. It plays a critical role in determining whether a hedge qualifies for special accounting treatment under relevant financial reporting standards, ensuring that gains and losses from both the hedging instrument and the hedged item are accurately reflected in financial statements. This process helps organizations manage their exposure to currency fluctuations and align their financial reporting with economic reality.