The MBx Interoperability Forum is significantly improving STEP translator quality and decreasing translator time-to-market
MBx Interoperability Forum

Recommended Practices - Geometric and Assembly Validation Properties

Geometric and Assembly Validation Properties
v4.5 (current) 2019-08-22 PDF
v4.4 2016-08-17 PDF
v4.2 2014-10-09 PDF
v3.2 2012-12-18 PDF
v3.1 2011-10-19 PDF