English: Intelligent versus Random Screening. An example simulation run of intelligent screening: cycles of QSAR learning/testing from a compound library. The data are taken for a screen of the Maybridge Hitfinder library against the P. vivax DHFR as target (electronic supplementary material). Intelligent screening is red and standard brute-force black. The differential utility of intelligent screening is shown in blue. It can be seen that it is cost-optimal to screen between a third and a half of Eve's small library, with a larger library the screened proportion would be expected to be smaller. Similar diagrams for the other targets can be found in the electronic supplementary material.