Generating useful information
  1. Is it more important for a long-term forecast to provide indicative general trends for future scenarios, or specific rankings of different possible outcomes?*
e.g. If a technology forecast is produced to examine the possible evolutions of existing products over the next 20 years, is it necessary to be able to predict rankings of specific technologies against each other in order to make valuable investment decisions, or are general trends sufficient in this long-term timeframe?