A problem not solved by this edition, however, was "multi-valued logic", where a signal's drive strength (none, weak or strong) and unknown values are also considered.
Antud versioon ei lahendanud aga “mitmevalentse loogika” probleeme, mille puhul tuleb arvestada ka signaali juhtimistugevust (puuduv, nõrk või tugev) ning tundmatuid väärtusi.