Tests in the world of reaction to fire are supposed to be representations of real fire scenarios, allowing us to grasp the characteristics of building products against them. While for the worst scenario (flashover fire) or the smallest ignition source (small flame), the definition is pretty straightforward. However, creating the intermediate method that the entire Europe would agree on was a bumpy ride. Our latest episode is a treasure trove of knowledge detailing the birth and maturation of the Single Burning Item (SBI,  EN 13823 ) test standard.  With the CEN SBI group  Convenor - Rudolf van Mierlo, we discuss the history and background of the standard, the background for some not-so-easy technical decisions and perhaps even tougher political ones.  In a project of this magnitude, everything matters - how do you ensure the method is reproducible and repeatable? How do you convey the exact amount of information in the technical standard? Will one of the measures eventually be the one that defines the final classification, and what does the classification reflect?Towards the end of the episode, we try to put those lessons from the creation and implementation of SBI into brainstorming a pathway for a new intermediate test we really need. An intermediate testing method for facades, as an effort for the Dutch government and a likely update to the existing ISO standard.Reading material:- The Rise of Euroclass by Angus Law et al. - a more detailed description of the politics behind the standard- The Single Burning Item (SBI) Test Method - A Decade of Development and Plans for the Near Future by Rudolf van Mierlo and Bart Sette- KRESNIK: A top-down, statistical approach to understand the fire performance of building facades using standard test data by Matt Bonner et al. - a more detailed description of how the Polish method handles different facadesAlso, if you enjoyed this episode, you will like this one too: https://www.firescienceshow.com/089-designing-law-by-disasters-or-not-with-birgitte-messerschmidt/Cover image - Effectis press release on changes to the SBI standard in 2020 - also a valuable source to see how the standard is evolving.