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Prerequisites:

To create a Requirements Coverage by Design Elements Legend

1. Create a Legend.
2. Create a Legend Item named '0%-25%'.
3. Right-click the Legend Item and open its Specification window. 
4. Click three dots  next to the Elements by Condition property to edit it.
5. In the Elements by Condition dialog, set the Element Type to Requirement.
6. Rename Custom to Query.
   
7. Select Create Operation > Operation from Model > All Leaf Requirements Owned Recursively.
   
8. Select Input > Reset.
   
9. Select Input > Contextual Variable.
   
10. Select All Leaf Requirements Owned Recursively > Edit > Copy.
    
11. Select the root node Query > Edit > Paste.
    
12. Select the copied operation > Use as... > Input of a New Filter.
    
13. Select Predicate > Nested Operation.
    
14. Select Body > Operation from Model > Not.
    
15. Select A > Reset.
    
16. Select A > Operation from Model > isEmpty.
    
    
17. Select Input > Simple Navigation. Select Satisfied By and set Is Applied to true, and Direction to Source To Target.
    
18. Select All Leaf Requirements Owned Recursively > Use as... > arg of a new Script.
19. From the Language drop-down list, select Javascript Rhino.

20. Insert the following script as the Body:

    Code Block
    language js title JavaScript Rhino
    var lowerBound = arg3.name.slice(0,arg3.name.indexOf("%"))/100 var upperBound = arg3.name.slice(arg3.name.indexOf("-")+1,arg3.name.lastIndexOf("%"))/100 arg2.size()/arg1.size() > lowerBound && arg2.size()/arg1.size() <= upperBound

    

21. Drag-and-drop Filter onto Create parameter to create a second parameter for the Script.
    
22. Select Filter > Remove.
    

23. Select Create parameter > Element > select the Legend Item for which the expression is defined.
    

    Note
    If you cannot see the Legend Item, make sure the Search for option is set to Any Element.

24. Clone the created Legend Item and rename the new items accordingly:
    1. 25%-50%
    2. 50%-75%
    3. 75%-100%