Approved by the SPE Board of Directors in March, this report documents the consensus from the SPE Summit held in March 2014. Topics covered in the technical report include reservoir properties, inflow modeling, outflow modeling, total volume, special cases, and reporting. Deterministic methods are proposed because of the wording of regulations and requirements for detailed well design and response planning, but parametric sensitivity analysis is recommended. All reservoir properties should be best-estimate success-case values based on sound geology, geophysics, and engineering judgment. Future improvements could include flow correlations for high rates in large-diameter pipes, sonic velocity effects, and probabilistic methods. For full details, read SPE-174705-TR.