While the exact names are proprietary, Meadows shares a representative case in his training seminars:

Many resources focus exclusively on either traditional plus/minus tolerancing or GD&T. Meadows covers both—and, more importantly, shows how to them within a single stack‑up analysis. This reflects real engineering practice, where a single assembly may contain features toleranced with both methods.

In a world racing toward digital twins and AI-driven design, the physical reality of part variation remains stubbornly analog. James D. Meadows gave engineers the tools to control that reality—not by over-constraining their designs, but by understanding them at a geometric, fundamental level.

James D. Meadows emphasizes that a tolerance stack-up is not just a calculation, but a . In his book, Tolerance Stack-Up Analysis , he argues that the goal is to determine the maximum and minimum possible distances (gaps or interferences) between surfaces in an assembly.

To get the most from Tolerance Stack‑Up Analysis , Meadows recommends: