4 The GPS and GD&T Language

4.1 Historical Evolution of the ISO and ASME Standards

4.1.1 The Birth of Tolerances

4.2 The GPS Matrix Model

4.3 The Fundamental ISO 8015 Standard

4.3.1 The Effect of ISO 8015 on Technical Documentation

4.3.2 The Main Concepts Defined in ISO 8015:2011

4.4 General Geometric Tolerances

4.4.1 The New ISO 22081 Standard

4.5 The New ASME Y14.5:2018 Standard

4.5.1 The Envelope Requirement or Rule#1 of the ASME Standard

4.6 The Main Differences Between ISO GPS and ASME GD&T Standards

4.6.1 The Different Concepts of Pattern and Simultaneous Requirement