Find a way to make it their idea. There is a saying "people support what they create" and this is very true. When people generate or help to develop an idea they are more likely to be engaged and to support it. Many times the kaizen leader has a great idea, or sees a golden opportunity to apply a textbook lean concept to a process. The people working in that process may not see it that way. Rather than fight over an idea, grapple with resistance and cause people to disengage from kaizen it is best to clarify and agree on the problem and ask them for ideas. Even if it is 30% wrong, let them try it.