Hi Jose,
CGAL, which is focused on computational geometry, and Fernando knows well, ends his philosophy page with this text that is interesting.
http://www.cgal.org/philosophy.html -------------------------------------------------- Beyond Robustness
Just for the record, I don't just know CGAL well. I am one of its active developers and even contributed to the internal discussions that lead to this piece of text you just quoted (for no clear reason though) I also invested quite some time working with BOTH GTL and GGL authors on the technical details of the robustness issues on their respective libraries, so I know in quite detail how the libraries handle this, FWIW (though as I say I am not sure what you point is here) Best -- Fernando Cacciola SciSoft Consulting, Founder http://www.scisoft-consulting.com