Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Walter A. Shewhart ne ya fara gabatar da SPC a Bell Laboratories a farkon shekarun 1920. Shewhart ya haɓaka jadawalin sarrafawa a cikin 1924 da kuma ra'ayin yanayin sarrafa ƙididdiga. Ilimin kididdiga daidai yake da ma'anar musayar da masanin ilimin lissafi William Ernest Johnson ya haɓaka kuma a cikin 1924 a cikin littafinsa Logic, Part 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 samfurin a kan ƙididdigar ƙididdiga mai ma'ana. Shewhart ya shawarci Kanar Leslie E. Simon a cikin aikace-aikacen jadawalin sarrafawa don kera makamai a Picatinny Arsenal na Sojojin a 1934. Wannan aikace-aikacen da ya yi nasara ya taimaka wajen shawo kan Sojojin Sojoji don shiga George Edwards na AT & T don tuntuɓar yin amfani da ƙididdigar ƙididdigar ƙididdiga tsakanin ƙungiyoyinta da 'yan kwangila a farkon yakin duniya na biyu.  Tambaya: Shin Walter Shewhart ya fara aikin SPC?
Gidan gwaje-gwajen Bell