I don't do much tolerance analysis work but reading this old article from I-DEAS got me curious about something.

1st page

SDRC - Paper: The Gaussian Assumption in I-DEAS Tolerance Analysis

2st page

SDRC - Paper: The Gaussian Assumption in I-DEAS Tolerance Analysis

3nd page

SDRC - Paper: The Gaussian Assumption in I-DEAS Tolerance Analysis

You can see they don't explain GD&T but employ a simple +- tolerancing scheme however they also automatically apply these to things like a parallel relation or perpendicular relation in a sketch. Does TolAnalyst make use of this too?