1. what were the 1st world model’s strengths and weaknesses?

2. what were the 2nd world model’s strengths and weaknesses?

3. what were the 3rd world model’s strengths and weaknesses?

like martin luther king.  

Strengths and weaknesses generally refer to a person's character. Often a strength can be a weakness, and vice versa, a weakness can be a strength. In Chinese philosophy, yin and yang (e.g., dark and light) are described as complementary opposites within a greater whole.

c) troops march forward in close formation against newer, more accurate weapons