Instead of focusing on weaknesses, give your attention to people's strengths. Focus on sharpening skills that already exist. Compliment positive qualities. Bring out the gifts inherent in them. Weaknesses can wait - unless they are character flaws. Only after you have developed a strong rapport with the person and they have begun to grow and gain confidence should you address areas of weakness, ...and then those should be handled gently and one at a time.
From Becoming a Person of Influence by Dr. John Maxwell.
To lead is to serve,