Principal Changes and Improvements .................................. 197
Al General ........................................................... 197
A2 Figures ............................................................ 197
A3 Section 1, Scope, Definitions, and General Dimensioning. ............ 197
A4 Section 2, General Tolerancing and Related Principles ............... 198
A5 Section 3, Symbology .............................................. 199
A6 Section 4, Datum Referencing ...................................... 199
A7 Section 5, Tolerances of Location ................................... 200
A8 Section 6, Tolerances of Form, Profile, Orientation, and Runout. ...... 202
A9 Appendix A, Principal Changes and Improvements. .................. 202
A10 Appendix B, Formulas for Positional Tolerancing .................... 203
Al 1 Appendix C, Form, Proportion, and Comparison of Symbols. ......... 203
Al2 Appendix D, Former Practices ......................................