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Video 2.4

The graph showing the number of states found at different depths in the 8-puzzle search is correct where first shown, but is wrong on later occurrences. A diagram showing the correct number of states by depth is available (thanks to Kory Becker).

• Eight-puzzle search space graph
• A* graph search enhanced chart

Video 2.8c

The number of minimal solution plans is actually much larger than what is given in the quiz. Let us know if you can work out the correct answer.

• answer for the quiz on number of solutions

Video 3.9a

There is an error in the audio track (and the transcript). I should have said But if we have a task network that contains a non-primitive task, that is, the task of a method, then we can use this method to accomplish the task in the network.

• ... task networks that contain a non-primitive task ...

Course material clarifications are also noted on this Clarifications page.