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JULY 2018 I SMT007 MAGAZINE 91 works. As originally envisioned with the first release of IPC-1752 in 2006, the data cascade is still deserving of more widespread understand- ing and more thorough implementation today. We realize the complexity of electronic prod- ucts, since even small personal use devices may contain hundreds to thousands of compo- nents, the key point here is that having good tools at the very beginning stage can be useful as the data builds in complexity up to reports for more complex products. Requirements Part Three: The Wildcard Detour By necessity, companies and standards orga- nizations themselves have used Reportable or Declarable Substances Lists (DSL) for years. One of the early lists was the Joint Indus - try Guide (JIG) which went through several updates. Amendment 3 to IPC-1752A includes the following statement: The IEC 62474 database of restricted and declarable substances replaced the Joint Industry Guide in January 2014. Meanwhile, most companies have created their own DSLs so that they will receive: • Data on those substances currently with regulatory restrictions • Data on industry-specific substances • Data on other substances the company's customers expect to know about • Substances that are not yet under any regulatory restrictions, but could be at some future date This latter case is exactly the REACH situa- tion shown at the beginning of this paper. While there are some ways to get advanced informa- tion about the next substances to be added to REACH, these are not usually foolproof. There- fore, companies tend to cast a rather wide net to ensure future substances are being included in their suppliers' declarations. The IEC62474 database as of this writing was most recently revised on September 3, 2017 and contains 137 declarable substances and 482 reference substances. Many companies have nonetheless found it necessary, for the reasons listed above, to develop more compre- hensive lists of their own. Without mentioning specific company DLSs here, a general review of some of the many that are used in the elec- tronics industry shows two basic trends: • Substances listed in common as a core set of substances, including those in common with the IEC62474 list • Substances that are less frequently found and not part of a common core list Since homogeneous material reporting is at the substance level, with authority being the CAS number, this presents a data handling/ segregation dilemma. Figure 3: Cascade of FMD data.