Lisa Jacobson, president of Manhattan-based Stanford Coaching Inc., asks potential joint venture partners to take the same behavioral test she uses to screen prospective employees. When Jacobson, whose company expected $2.3 million in 1996 sales, is approached by people interested in opening new sites for her exam preparation service, she asks them to take the behavioral test before she agrees to talk seriously to them. She uses it to filter out personality types that she'd find hard to work with.