Here is a QuikDiSC exercise to use at the beginning of your DiSC workshops that helps participants self-disclose right away.
Deal 5 QuikDiSC cards to each person. Ask the group to trade cards with one another in order to gather 5 words that best describe them. Ask participants to discuss why they chose the words they did. Then have them pick 3 words that describe why they've been most successful in what they do.