Recommended Practices Archive Model Styling and Organization v1.9 (current) 2021-03-08 PDF v1.8 2020-05-29 PDF v1.6 2018-08-17 PDF v1.5 2016-08-15 PDF v1.4 2014-01-23 PDF v1.2 2011-12-15 PDF v1.1 2011-09-05 PDF