Hierarchical Goals

• If you haven't noticed by now, hierarchy is a recurrent them in AI.
• We used it in semantic nets, planning, language and search.
• Hiearchy is so prevalent because it enables you to look at a problem at different levels.
• Hierarchy can of course be used with goals.
• As a person, I set goals for the year, and usually for the day. I also do it occasionally for the week or month.
• This same technique can be used for an agent.
• Manage high level goals, and break them down to smaller goals.
• This does lead to complexity, but reduces the size of the space.
• However, you can miss better solutions.