Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Passage: I whakahaeretia te SPC e Walter A. Shewhart i Bell Laboratories i nga tau moata o te 1920. I whakawhanakehia e Shewhart te mahere whakahaere i te tau 1924 me te ariā o te mana whakahaere tatauranga. Ko te mana tatauranga he rite ki te ariā o te whakawhiti i whakawhanakehia e te kaitohutohu a William Ernest Johnson i te tau 1924 i roto i tana pukapuka Logic, Part III: The Logical Foundations of Science. I te taha o tētahi rōpū i AT&T, tae atu ki a Harold Dodge rāua ko Harry Romig, i mahi ia ki te whakatakoto i te tirotiro tauira i runga i tētahi pūtake tatauranga whaitake hoki. I korero a Shewhart ki a Colonel Leslie E. Simon i te tono o nga mahere whakahaere ki te hanga patu i te Army's Picatinny Arsenal i te 1934. Ko taua tono angitu i awhina i te Army Ordnance ki te whakauru i a AT&T's George Edwards ki te korero mo te whakamahinga o te mana whakahaere kounga tatauranga i waenga i ona wehenga me nga kaikirimana i te pakarutanga o te Pakanga Tuarua o te Ao.  Pātai: I whakatū a Walter Shewhart i te SPC?
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