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Annex 1 made continuous monitoring a requirement. It did not make the data easy to trust. Settle plates in an isolator may be blind to the particle sizes that matter most. A measurable share of every sample is lost inside the transport tubing before it ever reaches the counter. Rolling averages can smooth a genuine contamination event into nothing. This handbook works through where those gaps open up in isolator filling lines, how to place and justify each sampling point, and what your trend data is really telling you.