Between two and three years, children begin to internalize what you say to them. They pay more attention to directions and store them in their memory bank.  When you say the same thing to a three-year-old, they seem to reflect, "Oh, yes, I remember."  

Note: The ability to make instructions part of themselves makes discipline easier.

Threes are easier to live with. Threes have the language skills that let two-way communication become real conversation.  Threes are more settled having spent a whole year refining their language skills.  

Threes are less egocentric (self-centered, selfish).  While twos notice their parent's emotions, threes get involved with them.   

Threes become more satisfied with themselves, more obedient, and begin to praise "self."  

NOTE:  Share your choice-making with threes!