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Was the OOS data calculated correctly? YES Is equipment adequately calibrated for sensitivity and accuracy? YES Are solutions and reagents prepared incorrectly, and/or degraded? NO Are personnel carrying out test method correctly? YES Perform full-blown OOS investigation. NO NO YES NO Confirm analyst understands appropriate calculation methods Calibrate equipment, and retest sample. Discard problematic solutions/reagents. Prepare fresh solutions, and retest. Retrain personnel for adequate method.