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"Elements of the design and construction of the towers, investigators said, certainly played a part in how long the buildings stood. Buildings designed differently - with more robustly protected and spread-out emergency stairwells, for example - engineers said yesterday, might still have resulted in fewer deaths.
But the most severe shortcomings identified at the World Trade Center in the institute's comprehensive review do not pertain to how the buildings were conceived or built. Instead, the failings on Sept. 11 were chiefly found in the response by the New York City Fire and Police Departments, which was hampered by inadequate command, unreliable communications equipment and an overwhelmed dispatching system.
For Leslie E. Robertson, the structural engineer who helped design the twin towers as a young man back in the early 1960's, the latest findings buttress his longstanding assertion that the towers were fundamentally sound. His wife, Saw-Teen See, who is a managing partner at Mr. Robertson's New York design firm, said the report "validates the way we thought the structure would have performed."