What is the analogy used to explain the importance of the three variables in Total Productivity Management?

The analogy is a three-legged stool, where each leg represents quality, total productivity, and technological innovation.
The analogy is a three-legged stool, where each leg represents administration, employees, and suppliers.
The analogy is a three-legged stool, where each leg represents evaluation, measurement, and planning.
The analogy is a three-legged stool, where each leg represents productivity, efficiency, and profitability.