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In the review of method validation data, it is expected that data for repetitive testing be consistent and that the varying concentrations of test solutions provide linear results. Many assay and impurity tests are now HPLC, and it is expected that the precision of these assays be equal or less than the RSD's for system suitability testing. The analytical performance parameters listed in the USP XXII, <1225>, under the heading of Validation of Compendial Methods, can be used as a guide for determining the analytical parameters (., accuracy, precision, linearity, ruggedness, etc.) needed to validate the method.