In front of nearly four dozen adults he has known barely an hour, Jeff Haag is explaining why he has a job in the warehouse of a pollution control company. "Basically, I'm working there because I failed miserably in so many interviews," he tells his audience.His soul laid bare, the 26-year-old explains he wants to improve his speaking ability and learn to express himself better. As he sits down, everyone applauds. At Dale Carnegie, no matter what you do everyone applauds. That's part of the program. Through courses that sometimes resemble cheerleading workshops and group therapy as much as instructional lessons, Dale Carnegie training classes teach effective communication, human relations and public speaking. They do it with enthusiasm. In 14 weekly sessions students learn how to improve their attitudes, worry less, develop confidence and sell themselves and their ideas. It all starts the first night. Before entering the classroom, each student puts on a name tag, the print in large block letters. "Hi, Randy!" and instructor greets a newcomer. "Hi, Lisa!" he chirps to another. It's the first indication of a Carnegie maxim: "Remember that a person's name is to that person the sweetest and most important sound in any language." By the end of the opening 3 1/2-hour session, almost all the students will know all their classmates' names, thanks to play-acting techniques and word-association tips. In a Dale Carnegie class, everyone is greeted by name. And applause. A session begins with dozens of clapping hands, followed by the standard greeting. "Good evening," an instructor says, his voice rising with the second word, "Good evening," the class responds, of course adding the instructor's name to the end of the salutation. Then, more applause. "The first couple minutes, it felt like an Amway meeting," says Barbara Martin, 31, an architectural planner, "But actually, I think it's really a good environment to get up and talk." Martin is in the fourth week of her Carnegie class in downtown Pittsburgh. She enrolled to improve her group presentations at work. Her company is footing the bill. "What surprised me," she says, "is the positive encouragement the class gives you." Since 1912, adults interested in imporving their lives have been giving Dale Carnegie the chance to help. The program's courses, designed by the author of the best-selling "How To Win Friends and Influence People," boast more than 3.5 million graduates. Among those who have proclaimed the sessions' virtues is Chrysler Chairman Lee Iacocca. Eighty percent of the Fortune 500 companies have had employees trained by Carnegie. Students take Dale Carnegie, they say, to be more effective in their jobs, more content in their homes, more productive in their lives. But 90 percent enroll for job-related reasons. The Carnegie techniques are geared toward instilling sincerity while emphasizing the importance of enthusiasm. "One of the most important things the classes teach is to try to see the other person's point of view and to show honest, sincere appreciation for the things people do," says J. Oliver Crom, president of the Dale Carnegie & Associates, headquartered in Garden City, N.Y. He attributes the courses' success to the "appeal to basic principles--people wanting to be the best they can be." Carnegie's classes are offered in 70 countries, including Hungary, which earlier this year became the first Eastern European country to offer the courses. Company officials, however, claim Soviet President Mikhail Gorbachev has been exposed to the system, having read "How To Make Friends and Influence People" in a Russian translation. That, however, is unconfirmed. And there's only one way to know for sure. At the next summit, notice if he says "George" every few words.