The 2018 edition contains data from 159 different experimental series that were performed at 54 different nuclear facilities. Some 156 of the 159 evaluations are published as approved benchmarks. The remaining five evaluations are published as draft documents only. All draft documents were reviewed by the International Reactor Physics Evaluation (IRPhE) Technical Review Group (TRG). Example calculations are presented; however, these calculations do not constitute validation or endorsement of the codes or cross section data.