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.

the cost of college has risen faster than inflation for many years.

the high price of student services and administration are two reasons for the rapid increase in cost.