solved I’m working on a history question and need an explanation

I’m working on a history question and need an explanation to help me understand better.

Joan Scott, “Gender: A Useful Category of Historical Analysis,” The American Historical Review, Vol. 91, No. 5. (Dec., 1986), pp. 1053-1075. (Skim pp. 1053-65; read closely pp. 1066-75). 

According to Scott, why is gender as a category of analysis important to the study of history? 

How does she define gender? 
What does she say about discourses of power and the construction of social relationships?  

As historians, how will gender as an analytic category help us in the study of women?  Explain.