HPDC found discrepancies in the hazard screening results of HPDs that were created by different tools. HPDC worked with Clean Production Action and its GreenScreen program to develop harmonized methods for screening that are described in Best Practices for Hazard Screening.

This harmonized method addresses the frequency of updating of lists used in GreenScreen and HPD hazard screening and an approach for handling compound groups within some of these lists. In addition, HPDC provides more details on aspects of hazard screening such as criteria for selecting HPD Priority Hazard Lists, definitions of hazard screening terms, and specific requirements for hazard screening for HPDs.