The report brings together two conference papers and a journal article (published or in press) which collectively summarize work to date under the JEIOG-supported effort to examine the utility of receptor modeling in the validation of VOC emissions inventories. All have undergone EPA peer and administrative review, as well as whatever outside review was required by the conference or journal to which each was submitted. The report puts in perspective their accomplishments and relationships, and previews the remaining work to be done.