https://www.operatingbyjohnbrewton.com/p/the-mckinsey-seven-ss-became-eightOperating by John Brewtonen2026-05-03T12:03:08+00:00The Mckinsey Seven Ss Became Eight in 2023https://www.operatingbyjohnbrewton.com/p/philip-kotler-formalized-stp-at-kelloggOperating by John Brewtonen2026-05-02T15:00:31+00:00Philip Kotler formalized STP at Kellogg in 1969 to make personalization economically possible.