Don’t solve their problem and tell them what to do. That puts you back in a war metaphor. Help them solve their own problem by asking questions, feeding their responses back to them, and subtly helping them consider whether what they’re saying makes sense. If they come up with a solution, they’re more likely to follow through with it. They don’t have to concede defeat and say “You’re right.” They’ll be less defensive if they solve their own problem.
