Not only did they leave old code in the system, but they made changes to it without reviewing whether the old code would still work correctly, despite still bei

Not only did they leave old code in the system, but they made changes to it without reviewing whether the old code would still work correctly, despite still being callable: In 2003, Knight ceased using the Power Peg functionality. In 2005, Knight moved the tracking of cumulative shares function in the Power Peg code to an earlier point in the SMARS code sequence. Knight did not retest the Power Peg code after moving the cumulative quantity function to determine whether Power Peg would still function correctly if called. If you want to leave the old code in, fine, but then it still needs to be tested.