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By teaching them the skills and put them through practical implementation of those skills. Assess the results and put them into more education and practce, if your see improvements. If they continue to fail they most probably can't make it because they don't have what it takes.
Through training
Talk/Train/Discuss to the person and explain him what you need from him.Give time and freedom to take his decision and help him during the process in constructive manner.Have patience/faith in him.It is definately going to help him to improve as leader of future.