Level #1 -convert the histogram code to Produce the histogram.
    
    < For each level list the tasks that need to be completed >
    < Estimate the time to complete this level >
    < Record the actual hours when complete >

Initial estimate =
Actual time = 

Level #2 (after task #1 completed) - traverse the sorted list:
    
Initial estimate  = 
Re-estimate after level #1 completed = 
Actual time = 

Level #3 (after task #2 completed) - process the final tree:
   
Initial estimate = 
Re-estimate after level #2 completed = 
Actual time = 

Project Total

Total original estimate =    
Total revised estimates = 
Actual =                       134 (49% over original, 4% over revised)