Which accounting concept relates to changes requiring special disclosures?

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The concept that relates to changes requiring special disclosures is a change in accounting principle. This occurs when a company adopts a different accounting framework or alters its method of accounting for certain transactions. Such changes can have significant effects on financial statements and the overall portrayal of a company's financial health.

When a change in accounting principle is made, it typically necessitates specific disclosures in the financial statements. This might include a description of the new principle adopted, the reasons for the change, and the effect of the change on financial statements for both current and prior periods. This disclosure ensures transparency and maintains the integrity of financial reporting by allowing users of the financial statements to understand the impact of the change on the company's financial position and performance.

In contrast, while a change in accounting estimate and fair value measurement may involve adjustments in financial reporting, they do not typically necessitate the same level of disclosure regarding the fundamental shift in accounting approach that is characteristic of a change in accounting principle. Revenue recognition challenges are more about the timing and measurement of revenue rather than shifts in accounting methodology.