 TLM was supposed to come out as TBM (= transaction-based modeling).In 2000, Thorsten Grötker, R&D Manager at Synopsys was preparing a presentation on the communication mechanism in what was to become the SystemC 2.0 standard.Gilles Baillieu, then a corporate application engineer at Synopsys, insisted that the new term had to contain "level", as in "register-transfer level" or "behavioral level".