A segmented wall is observed to be bulging near the middle, and after a heavy rain part of the wall topples. The designer blames the contractor, the contractor blames the designer, and the owner blames and sues them both. You are retained as an independent expert to help determine whose insurance should pay for the repair. You also are aware that most wall failures are caused by inadequate foundations. What tests and methods of analysis would you use to determine if the wall was improperly designed and/or poorly constructed?