error messages can be in the wrong places 
        there can be fewer errors than the number of error messages
        having someone else read your code can be useful
        coming back to your code the next day can be helpful
        error messages can be misleading. the most important thing is that they occur, not what they say
    
    
    Debugging: 
        printing out values
        divide and conquer
     
     
     Tricks 
        using stubs
        copying from another piece of code
      
      
      Maxims
        DRY
        KISS
        
constants are expressions too
       
       
 Change the way formats are displayed, removing <XXX> and using colors
 
 All formats should be followed by examples