Discussion
Match each planning technique with its characteristic feature.
List I
A. Progression
B. Regression
C. Partial order planning
D. Hierarchical planning
List II
P. forward from the initial state
Q. backward from the goal
R. least commitment on ordering
S. decomposition of abstract tasks
Select the correct match.
Answer: A
The four differ in what they search over: states forward, states backward, plans, and task decompositions. Naming the search space is the quickest way to predict a planner's branching factor and the heuristics that will apply to it, and it organises the whole topic more usefully than a chronological account of the algorithms would.
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