The Goal (first published 1984) is a business novel by Eliyahu M. Goldratt that introduces the Theory of Constraints (TOC). Framed as a story about plant manager Alex Rogo racing to save his factory, the book teaches operational improvement through identifying and managing bottlenecks, focusing on throughput, inventory and operational expense, and using continuous improvement (the Five Focusing Steps). The result: practical, systemic thinking that shifts measurement and decision-making away from local efficiencies and cost-accounting metrics toward system-wide throughput optimization.
everything else (align all non-constraints to support the bottleneck).
For those interested in reading "The Goal" by Eliyahu M. Goldratt, there are several PDF formats available. You can find the book in PDF format through various online platforms, including: