Right. I think you could say that the unusual design contributed to the failure, if only because the on-site changes were made using assumptions that would have

Right. I think you could say that the unusual design contributed to the failure, if only because the on-site changes were made using assumptions that would have worked on a more conventional design. It's kind of like batteries. It used to be that you'd want to discharge battery cells completely before recharging them. This was true for Ni-Cad cells. With newer Li-ion cells, doing this is actually dangerous. It's not necessarily the chemistry's fault when an over-discharged cell starts a fire later on, but if you substitute a new design, you'd better cover the new rules with the implementation people.