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Since the introduction of the G-function derivative analysis, pre-frac diagnostic injection tests have become a valuable and commonly used technique.  Unfortunately the technique is frequently misapplied or misinterpreted, thus leading to confusion and misdiagnosis of fracturing parameters.  This presentation will demonstrate a consistent method of analysis of the G-function, its derivatives, and its relationship to other diagnostic techniques including square-root(time) and log(DPwf)-log(Dt) plots and their appropriate diagnostic derivatives.  Actual field test examples will be presented for the most common diagnostic curve signatures.