The auditor waited, patient but expectant. "Let me rephrase. Where do you keep all the essential documents for this trial? All of them, in one organized system?"

Marcus felt a slow flush of recognition. He had been filing documents diligently for two years. He had followed the sponsor's instructions. He had kept things organized. But he had never stepped back to ask whether all those individual documents formed a coherent whole, whether they told the complete story of this trial's conduct, whether an inspector could use them to verify that GCP had been followed.

The auditor smiled, not unkindly. "This is actually quite common. Let me show you what I mean by a Trial Master File, and why it matters."

The auditor waited, patient but expectant. "Let me rephrase. Where do you keep all the essential documents for this trial? All of them, in one organized system?"

Marcus felt a slow flush of recognition. He had been filing documents diligently for two years. He had followed the sponsor's instructions. He had kept things organized. But he had never stepped back to ask whether all those individual documents formed a coherent whole, whether they told the complete story of this trial's conduct, whether an inspector could use them to verify that GCP had been followed.

The auditor smiled, not unkindly. "This is actually quite common. Let me show you what I mean by a Trial Master File, and why it matters."