Different opinions do not mean that one of you is right and the other is wrong. Try to present your different view by omitting "but" and using "and" instead. Example: "You say that we need to save a part of our budget to organize a customer event and (not but) I think we should invest this money in employee training. So what options do we have?"
2. Speak hypothetically
Try to ask your team members to imagine a hypothetical scenario. Example: "You say that we do not have the right salespeople to start our campaign. How would the campaign look like if we had them?"
3. Ask about consequences
Disagreeing without any explanation does not make sense. Use open questions to inspire your team members to think about the consequences. Example: "When we launch our new product only in the U.S. market, what impact will it have on our customers in other countries?"
4. Search for cause
When you disagree with something, first try to understand the thinking of the other person. Openly ask what the objective of the proposed solution is. Then you may find a different one. Example: "I must admit that I was surprised by you suggestion. What goal do you want to reach?"
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Article source Psychology Today - a U.S. magazine and online community focused on psychology