This paper presents a case study of the successful implementation of XLE (eXtreme Limited Entry with interdisciplinary evaluation and validation. The case study resulted in significant improvements and cost reductions in the completion designs. XLE was implemented in two groups of wells in Williston Basin, ND. Both groups consisted of Three Forks (TF) and Middle Bakken (MB) wells in a wine-rack pattern. RA tracer and DAS/DTS data indicated that 85–95% cluster efficiency was achieved using XLE, even in higher cluster count stages. High cluster efficiency appears to be independent of the geologic target in both MB and TF wells. This paper presents a comprehensive evaluation of the completion diagnostic measurements and the subsequent integration of these measurements with detailed geologic characterizations and "stage level" well performance evaluations. This multidisciplinary approach resulted in more reliable completion optimization decisions and a shorter cycle time from measurement to implementation.