Diesel engineers have to worry about meeting very stringent emission standards with reliable and durable devices that are economically viable. Impending EPA Regulations will require emissions reduction systems to work for 435,000 miles on Class 7 & 8 trucks. There will be onboard diagnostics to tell how well they are complying with the emission regulations. The biggest challenge is for the light-truck clean diesel engine manufacturers to meet the Tier 2 Standards by 2007. The benefits of diesel engines are substantial and so is the degree of difficulty meeting the emerging diesel engine emission standards. This Workshop is organized to assist development of the necessary technology to enable compliance with these standards.