Which kind of planning consists of successive representations of different levels of a plan?

Answer: Option A

Hierarchical planning involves representing a plan at different levels of abstraction or granularity. It breaks down complex tasks into simpler subtasks, which are organized in a hierarchical structure.
This approach allows for a clearer understanding of the overall plan by dividing it into manageable components, each with its own level of detail.
Option B: Non-hierarchical planning doesn't involve the representation of different levels of a plan in a hierarchical manner.
Options C: All of the above and D: Project planning do not specifically address the representation of different levels within a plan.
Therefore, the correct choice emphasizing successive representations of different plan levels is Option A: hierarchical planning.