jeffrey-liker's codification of TPS as 14 management principles organized in a four-level pyramid (the "4P" model). Published by McGraw-Hill, 2004.
Overview
The four levels: (1) Philosophy — base management decisions on long-term thinking even at the expense of short-term financial goals; (2) Process — create continuous process flow to bring problems to the surface (including just-in-time, kanban, heijunka, jidoka); (3) People/Partners — develop your people and partners (including kaizen, gemba, a3-thinking); (4) Problem Solving — continuously solve root problems to drive organizational learning (including five-whys, standard-work).
Key Arguments
Liker spent over 20 years studying toyota-motor-corporation. His 14 principles represent the most comprehensive Western attempt to capture the full TPS management system — not just the production tools. The 4P pyramid explicitly addresses the criticism of earlier lean books (the-machine-that-changed-the-world, lean-thinking) that they overemphasized process tools and underweighted the people-development and philosophical dimensions.
Key insight: Toyota's success cannot be replicated by adopting its tools — it requires adopting its management philosophy, people-development practices, and problem-solving discipline. The tools are outputs of the culture, not inputs.
Significance
The book became the bestselling TPS text and popularized "the Toyota Way" as a synonym for TPS, though Toyota insiders distinguish between the corporate philosophy (codified internally as the "Toyota Way 2001" document by fujio-cho) and the production system. Liker and David Meier later published the-toyota-way-fieldbook as a practical companion.