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==Modern use==
While this method of quality control clearly is not proof against systematic errors or operator misread entries from a source document, it is very useful in catching and correcting random miskeyed strokes which occur even with experienced data entry operators. However, it proved to be a fatally tragic flaw in the [[Therac 25]] incident. This method has survived the keypunch and is available in some currently available data entry programs (e.g. [[PSPP]]/[[SPSS]] Data Entry). One study suggests that, at least in simulated circumstances, a single-pass data entry with range checks and {{clarify|text=skip rules|date=October 2024}} might not significantly alter the reliability of outcomes compared to studies using two-pass data entry;<ref>{{cite journal |last1=Day |first1=Simon |title=Double Data Entry: What Value, What Price? |journal=Controlled Clinical Trials |year=1998 |volume=19 |issue=1 |pages=15–24 |doi=10.1016/S0197-2456(97)00096-2 |pmid=9492966 }}</ref> however, it is desirable to implement both systems in a data entry application.
==References==
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