This Toolkit is a methodology to help countries just developing their inventories to estimate releases of PCDD/PCDF and also leads them through the process of how to enhance and refine these inventories. The Toolkit’s goal is to guide the inventory makers within a country in the techniques and stages of the inventory by giving examples and check parameters for classification of sources. The Toolkit also highlights the pathways of the PCDD/PCDF into the environment or other matrices. Finally the Toolkit is robust enough to characterize releases in orders of magnitude and for sectors as a whole.