Appendix C

SOURCES

Every external source, by chapter. Web sources were read in September 2026.

Noise and control charts (chapters 2 to 4)

Regression, skill and luck (chapters 5, 6)

Playbooks and case studies (chapters 7, 8)

Deciding before you know (chapters 9 to 12)

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Written by Andrew Lauchner, a growth and retention operator for consumer brands. The paid work is one ninety-day Sprint.

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