No rocket science needed. The extroverts will have you laughing in minutes because they most likely will have a great sense of humor. But the introverts may take more time. Now is the time to encourage your client to act like an extrovert.
In a study of over 10,000 people from 48 countries psychologists Ed Diener at the University of Illinois at Urbana-Champaign and Shigehiro Oishi of the University of Virginia found that people rate happiness as being more important than money or living a life with meaning. The study encouraged the introverts to act like extroverts for 10 minutes. This exercise elevated the happiness factor and makes for one great smile.
Thanks for taking the time!