In Spain most large contracts and others of ordinary size come with quality control imposed by the owner on insurance convenience or by obligation. This practice is just starting, and as lots of things in construction here is being very mismanaged, for it may turn the reviewer is less able than the designer out of hiring less than expert professionals being cheaper for the task, what causes more than reasonable disgust in designers.
Furthermore the intrusion (for as performed so can be many times) can be used and is a non despicable number of times used to further agendas not precisely on account of the good engineering, but to removal of the standing engineering team by another invisibly linked to the quality reviewing party, or to unwarrantedly encroach upon the fame of others).
That is, the problem is that the second pair of eyes not are always looking with good eyes, but as preying ones.
So I have nothing bad to say about ensuring quality, but I am not partisan of letting enter the fox into the barn. For the process not to produce the bad effects potential and actually seen, a more collaborative than competitive mind setup is required.
See, the works in a highway here have damaged through settlement another aqueduct of old. In days the reparation scheme has doubled in cost! Yes, better of course, but, I mean, Is it technical quality about we are talking about or are there always other agendas that deeply distort this?