Continuously vs. discontinuity
In this issue, the main question, which is important for the observation is: "How does the development creature proceed?"
When we talk about discontinuity development, we talk about a qualitative change in the bahavior. To illustrate this more efficiently we can think about the logic of a child. When a child is at the age of 5 it would give different answers to questions than it would in it's teenage years. A child would identify peace as to not hurt a friend, which is in this case a non abstract answers. But later this same child can tell us that for example peace is harmony or a world without war etc. when it grew up to a teenager. This would be a logical and abstract answer.