The article discusses the importance of accurately modeling case duration variability in operating room (OR) scheduling simulations. Dexter et al. used a log-normal distribution to simulate case durations, but the authors question whether they properly accounted for individual case duration variability in their simulations. They argue that omitting this variability could significantly affect the results. The authors also question the source of the data used to generate the probability distribution for "open time available for add-on cases" and whether this data was based on daily schedules or actual recorded open times. Additionally, they question whether the authors considered the impact of "fuzzy constraints" on overtime calculations and whether the effect of long turnover times was adequately addressed. The authors also raise concerns about the applicability of the "variable-sized bin packing" model to real-world OR scheduling problems and whether the tested algorithms were validated in actual OR settings. Finally, they question whether any of the algorithms were tested in the same OR suites to confirm their effectiveness. The authors suggest that including case duration variability in the simulation would have improved the accuracy of the results. The study was published in Anesthesiology in 2000.The article discusses the importance of accurately modeling case duration variability in operating room (OR) scheduling simulations. Dexter et al. used a log-normal distribution to simulate case durations, but the authors question whether they properly accounted for individual case duration variability in their simulations. They argue that omitting this variability could significantly affect the results. The authors also question the source of the data used to generate the probability distribution for "open time available for add-on cases" and whether this data was based on daily schedules or actual recorded open times. Additionally, they question whether the authors considered the impact of "fuzzy constraints" on overtime calculations and whether the effect of long turnover times was adequately addressed. The authors also raise concerns about the applicability of the "variable-sized bin packing" model to real-world OR scheduling problems and whether the tested algorithms were validated in actual OR settings. Finally, they question whether any of the algorithms were tested in the same OR suites to confirm their effectiveness. The authors suggest that including case duration variability in the simulation would have improved the accuracy of the results. The study was published in Anesthesiology in 2000.