Conclusion
   - Take Home Points
      
	- Rule Based Systems consist mainly of: 
	an Inference Engine, which is the same for different rule bases; 
	a Knowledge Base (rules and working memory): 
	and a UI.   
	- The inference engine runs through a recognise and act cycle.  
 
	- Rule Based Systems are formally as powerful as structured
	  programming, less organised, but easier to use and
	  understand 
 
	- It's easy to get explanatory powers from a Rule Based System by 
	  showing the rules that were applied  
 
      
    
   - Reading:  For this week is Brachman and Levesque Chpt 6.
   
 
   - Reading:  for next week is Russell and Norvig 373-386 (the Planning
       Chapter sections 1 and 2).