Of large agencies, those with more than 15,000 employees, the highest rates of complaints were filed at Education, HUD and Transportation, while among medium agencies, those with 1,000 to 15,000, the highest rates were at the Government Printing Office and EEOC itself. EEOC, like other adjudicatory agencies, has been encouraging use of alternative dispute resolution to avoid the often lengthy and contentious formal allegations. The Postal Service had the highest ADR participation rate in the pre-complaint process, 76 percent, followed by HUD, 49 percent and Air force, 38 percent.