They cooperate just fine. You have to prototype and physically test, because you can't possibly factor every single variable in, to utilize virtual testing as the majority of your product development process. Toyota themselves admitted to that in 2007, when then CEO Katsuaki Watanabe said they would do more prototyping.Bunky said:You can pull if it off if you are confident on the design and makes sense when it works, Otherwise, you have to deal with two tools to debug, etc.
It does take cooperation from the designer, manufacturing engineer, and the molder to pull it off. In many eng companies (I am think American companies) there is a lack of cooperation between the various groups. It is another culture thing. It is more toss it over the wall mentality.
It also shows they are not trying to get it right the first time...let's practice once because we have little confidence.
Here's an article from 2007 on this: Quality Concerns
For several years, Toyota has taken pride in reducing vehicle development time and adopting time-saving innovations such as virtual prototypes. But those measures have lowered the quality of Toyota vehicles, engineers and executives acknowledge.