The developers are indebted to John B. Smith's ARRAS program and Susan Hockey's Oxford Concordance Program, by which Usebase has in part been inspired. Brigham Young University's WordCruncher has also influenced Usebase in some aspects of design. Both TACTstat and TACTfreq are derived from MTAS (Micro Text-Analysis System) written by Lidio Presutti and Ian Lancashire (vers. 1.0 ; vers. 2.0 ). Also see Non-TACT files below.