As cs22 had mentioned, the response to a failure depends on the severity of the problem. Throughout the project it is important to meet the requirements that were laid out in the beginning. If failures occur with experiments and with vendors, the reasons why the results were not as expected need to be determined. If a resolution with the vendor cannot be found, then you should look into using other vendors. Regulations must be complied with and customer demands must be met, otherwise you will have no product to sell.