Not sure if this is the most current,

But




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From page 382:::



Statement of Problem and Substantiation for Public CommentThe proposed new version of Chapter 28 is unnecessarily lengthy and conflicts with existing NFPA 921 methodology for investigating fires. The treatment of all fires should be as uniform as possible, instead of being as diverse as possible. The principles of combustion are the same, irrespective of where a fire occurs. Detailed specifics of a particular fuel type should be treated in the context of existing science and existing methodology, instead of being developed in a discongruent manner. Fires occurring in vegetation fuels present some burn patterns which are different from fires in structures. This is accepted science and has been recognized in the existing 2017 NFPA 921 edition. But the research basis for determining what are valid burn patters (and their proper interpretation) is exceedingly poor. The literature thus far offers only a single peer-reviewed paper on this topic (Simeoni, A., et al., A Preliminary Study of Wildland Fire Pattern Indicator Reliability Following an Experimental Fire, J. Fire Sciences 35, 359-378, 2017). Furthermore, the results of this paper do not offer adequate support for the validity of the 14 NWCG indicators. Thus, instead of adding more text which fails to provide adequate validation, efforts should be made to produce more validation studies. Only when such studies have been performed successfully should a systematic revision of Chapter 28 be undertaken. And when such a revision is undertaken, the guiding principle should be that the techniques described should be as congruent as possible to the rest of the NFPA 921 document, instead of being at odds with






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