Because of major advances in hydraulic fracturing and horizontal drilling technology, vast tracts of gas bearing shale formations have become a significant source of hydrocarbon production in North America and beyond. These formations are called unconventional resources because they cannot be developed and produced by conventional production methods. As a result of their low permeability, higher intensity operations such as drilling a horizontal wellbore in the formation and creating multiple transverse hydraulic fractures crossing this wellbore are essential to make unconventional reservoirs economically viable. Although the type of formation and experience with horizontal wells in a specific formation will dictate the most appropriate type of well completion to be used, a commonality is the use of simultaneous injection into multiple entry points (i.e., clusters of perforation holes made in the casing and cement) with the intent of creating multiple hydraulic fractures in each of multiple, repeated stages (see Figure 1). Typically, each stage comprises three to six perforation clusters, and each stage is repeated 20-40 times on each well. The goal of this completion technique is to generate uniform hydraulic fractures from all perforation clusters within a stage; hence, to create high conductivity pathways to the formation for oil and gas production that uniformly stimulate the reservoir rock. However, industry experience with field data analysis (i.e., production logging during which a flow sensor is moved through the well to measure the contribution of each perforation cluster to the overall production rate) and predictions from simulations make it clear that uniform stimulation can be an elusive goal. For example, Miller et al. (2011) interpreted hundreds of production logs from multiple basins, concluding that approximately two thirds of perforation clusters contribute to well production. Similarly, Molenaar et al. (2012) published one of the first studies using distributed acoustic sensing (DAS) technology with fiber optic cables in a horizontal wellbore, thereby detecting that