The described process is Blind Verification, also known as double data entry with blind verification. In this method, two independent operators enter the same data. The second operator is blinded to the first entry to avoid bias. When discrepancies arise, the system flags them for review, and the second entry (or an adjudicated value) is retained as the correct one.
According to GCDMP (Chapter: Data Entry and Data Tracking), blind double data entry is used primarily in paper-based studies to minimize transcription errors and ensure data accuracy.
Single entry (D): Only one operator enters data.
Manual review (B): Involves post-entry checking, not during entry.
Third-party compare (C): Used for reconciling external data sources, not CRF data.
Hence, option A (Blind verification) is the correct and CCDM-defined process.
Reference (CCDM-Verified Sources):
SCDM GCDMP, Chapter: Data Entry and Data Tracking, Section 5.1 - Double Data Entry and Verification Methods ICH E6(R2) GCP, Section 5.5.3 - Data Entry and Verification Controls FDA Guidance for Industry: Computerized Systems Used in Clinical Investigations, Section 6.2 - Data Accuracy and Verification