From personal experience, I believe a child could be all three depending on the situation. Easy children generally stay in positive mood, establish regular routines, and adapt easily to new experiences. Difficult children react negatively and cry frequently, engage in irregular daily routines, and are slow to accept change. Slow-to-warm-up children have a low activity level, are somewhat negative, and display a low intensity of mood. 

My 5 year old son is a very easy going children when he is doing something that he enjoys like being outside. It is easier to give direction. He listens and accepts what I am saying and returns to his activities a happy child. He tends to be more difficult when he has to do something e doesn't enjoy...like eating his dinner instead of playing. This when the attitude comes out and he becomes defiant. He is less likely to listen to me and