scalogram
noun
                                                                                                                            
                                                            sca·lo·gram
                    
                                                                                                              
                                                                                                                                  ˈskā-lə-ˌgram 
                                                      
                                                          
            
                                
              
          
                                                      : an arrangement of items (such as problems on a test or features of speech) in ascending order so that the presence or accomplishment of an item at one level implies the presence of or the capability to accomplish items at all lower levels                                      
                
                    
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  Merriam-Webster unabridged




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