The concepts were the Millimeter Array (MMA) of the United States, the Large Southern Array (LSA) of the European Southern Observatory and the Large Millimeter Array (LMA) of the National Astronomical Observatory of Japan.
Den ALMA hat seng Ufäng an dräi astronomesche Projeten: dem Millimeter Array (MMA) vun den USA, dem europäesche Large Southern Array (LSA) an dem japaneschen Large Millimeter Array (LMA).