Abstract Rapid exploitation of domestic unconventional resources over the last decade has left engineers and reserve evaluators scrambling for reliable methods to analyze performance of, and assign reserves to, wells completed in these reservoirs. Numerous publications from professional societies have attempted to address this shortcoming. This presentation begins by summarizing one of the more recent such contributions, SPEE Monograph 4 – Estimation of Developed Reserves in Unconventional Reservoirs. Next production data from several unconventional wells are analyzed following the workflow presented in Monograph 4. These analyses include identification of flow regimes by constructing diagnostic plots, application of selected models to the production data, and forecasting future production to obtain estimated ultimate recoveries. Each analysis will conclude with a comparison of results from the modified Arps method, the current industry standard, with those from other methods. Biography John Seidle is a Vice President with MHA Petroleum Consultants LLC in Denver, Colorado. He has more than thirty years of experience in unconventional gas and oil reservoir engineering in domestic and international plays. His current duties include unconventional reservoir engineering, reserve studies and economic evaluations, and serving as an expert witness for litigation and regulatory hearings. Privileged to work with others on over 25 technical papers and 6 patents, he is the author of Fundamentals of Coalbed Methane Reservoir Engineering. He is chair of the SPEE committee working on Monograph 4 “Estimating Developed Reserves in Unconventional Reservoirs”. He received a PhD in Mechanical Engineering from the University of Colorado, is a member of SPE, AAPG, and SPEE, and is a Registered Professional Engineer in Colorado, Oklahoma, and Wyoming.#ReservoirDescriptionandDynamics