The Granite Wash formation continues to be a prolific hydrocarbon producer, with over 1600 wells drilled during the past 10 years.  During 2012 and 2013 an extensive development program was initiated by one operator in which 144 wells were drilled and completed with multi-stage hydraulically stimulated horizontal wells.  These wells utilized various types of completion diagnostics to: (1) evaluate vertical and horizontal communication within the Granite Wash, (2) identify potential horizontal loading problems and (3) characterize long-term fracturing fluid movement.  This presentation will share highlights from a very large completion diagnostic dataset and the resultant applications to production optimization.