Total Coverage for a Tile and Trace Score

Anthony C.
Anthony C. Member, Medical Devices & Life Sciences Solution Posts: 16
in Live Trace Explorer™

I am going to use Jama's example for my question (see image below)

I understand how the percent coverage of SubSystems by the individual items of User Story, Subsystem Verification, and Design Description is determined.

I need help understanding how the total percent coverage for a tile (i.e. the 24.24%) is computed and how that relates to the Trace Score.

image.png

Comments

  • FrancisT
    FrancisT Jama Staff, Product Manager Moderator Posts: 5

    Coverage is a % measure of:

    [sum of actual relationships] divided by [sum of expected relationships]

    for all items in your component or set (SubSystems in this case)

    The same equation applies for the Trace Score at the top right of the diagram, however the scope of items considered would be the entire project (well all tiles represented on your diagram).

    I hope this helps.

    Francis.

  • Anthony C.
    Anthony C. Member, Medical Devices & Life Sciences Solution Posts: 16

    Thanks. I think I understand Coverage. But Trace Score is still a little unclear. For example if I have two tiles with a total coverage for one tile at 100% and a total coverage for a downstream tile at 50%, what would the trace score be?

  • FrancisT
    FrancisT Jama Staff, Product Manager Moderator Posts: 5

    The key is to count items, and multiply by expected relationships, as defined by your relationship rule

    Picking on your example and building on it. Given the following relationship rule.

    [A] → [X]

    [B] → [Y]

    First Tile

    4 items [A], all covered by [X] downstream

    Coverage: 100%

    Second Tile

    2 items [B], only one is actually covered by [Y] downstream

    Coverage: 50%

    Total Score: Actual relationships / Expected relationships

    4 + 1 divided by 6 = 83.3%

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