(4)To help potential users to choose the most appropriate benchmark from amongst a range of potentially suitable benchmarks, they should be given information to allow them to understand what a benchmark aims to measure, what input data is used and how it is selected, what the constituents of the benchmark are, who is involved in the data collection and benchmark calculation, when and to what extent discretion may be used, and what the limitations of the methodology are and when and how the benchmark might be changed.