English: Summary of utility modelling. Diagram of the maximum utility of intelligent screening taken from a systematic scan of different costs/utilities in the econometric model (a), using the screening results in (b). To make these results comprehensible, we project them down into a three-dimensional graph and combine cost/utilities: time ratio = Tc/Tm and cost ratio = Uh/Cc. This indicates that intelligent screening is generally rational (there is little area of negative utility), and that a high time-ratio (fast screening) and low cost-ratio (valuable library compounds) are most favourable.