SPC ya fara ne daga Walter A. Shewhart a Bell Laboratories a farkon 1920s. Shewhart ya haɓaka jadawalin sarrafawa a cikin 1924 da kuma manufar yanayin sarrafa ƙididdiga. Kulawa na ƙididdiga daidai yake da manufar musayar da masanin ilimin lissafi William Ernest Johnson ya haɓaka kuma a cikin 1924 a cikin littafinsa Logic, Sashe na III: The Logical Foundations of Science. Tare da ƙungiyar a AT&T wanda ya haɗa da Harold Dodge da Harry Romig ya yi aiki don sanya binciken samfurori a kan ƙididdigar ƙididdiga mai ma'ana. Shewhart ya yi shawarwari tare da Kanar Leslie E. Simon a cikin aikace-aikacen jadawalin sarrafawa don ƙirar bindigogi a Picatinny Arsenal na Sojojin a cikin 1934. Wannan aikace-aikacen ya taimaka wajen shawo kan Army Ordnance don yin shawarwari da AT&T George Edwards don yin shawarwari game da amfani da sarrafa ƙididdigar ƙididdiga tsakanin masu kwangila da kuma fashewar Yaƙin Duniya na II. Tambaya: Shin Walter Shewhart ya jagoranci SPC?
Gidan gwaje-gwajen Bell