Conclusion
   - There are other mechanisms for planning, though the symbolic
       remains in favour for many domains. 
 
   - Take Home Points
      
	- The strips symbolic mechanism, with action, preconditions, facts
            and effects, can be quite efective. 
 
	- You can chain forward or backward through this state space. 
 
	- For larger tasks, you need to either combine chaining mechanisms,
            use hierarchical planning or both. 
 
	- Heuristics can often be effective. 
 
      
    
   - Reading:  For this is Russell and Norvig 373-386 (the Planning
       Chapter sections 1 and 2).
   
 
   - Reading: for next week is
     
       practical advice for analysis of large complex data sets .
       You might also want to look at MAD Skills: New Analysis Practices for 
       Big Data by Cohen, Dolan, Dunlap, Hellerstein and Welton.