I think it depends on the type of work (and also legislation). For example I had architects calculating which kind/size of iron girder/joist (IDK the exact Engl

I think it depends on the type of work (and also legislation). For example I had architects calculating which kind/size of iron girder/joist (IDK the exact English word for it) put to replace a supporting wall. If they calculate that badly, the roof comes down at some point, and I die.