In a situation in which the consequences are so grave, you end up never vouching for the software as fit for purpose. Rather you claim best efforts to ensure f

In a situation in which the consequences are so grave, you end up never vouching for the software as fit for purpose. Rather you claim best efforts to ensure fitness, and what you do vouch for is the testing you performed. If people at the top end of the pay scale signed off on your test plan, and you fully completed all testing successfully, it’s very difficult to find you blameworthy.