For 60 years, state and federal governments, commercial entities and nonprofit organizations have turned to TDEC to provide c ... ost-effective solutions for labor-intensive functions, such as document management, administrative support, call center assistance, financial processing and lockbox services. And TDEC has consistently delivered a quality product, on time, and on or under budget. Our quality management practices are ISO 9001-2008 certified. TDEC is a HUBZone Small Business headquartered in Oakland, MD. Our operations take place in-house at our headquarters or at one of our several other facilities located across the country. This geographic spread allows us to provide the fastest turnaround time while maintaining the highest degree of quality control and security. read more