The most difficult aspect of scientific injection molding isn't really what you might expect. Some folks might guess the biggest challenge to overcome is tooling design or machine repeatability, but, in my opinion, it is something much simpler: pushback.
"Pushback" is, simply put, the resistance that the old guard, or those that just don't quite understand the process, will put up during scientific molding implementation. It is difficult for people that have been in the industry for a long time to come to terms with the fact that they have been doing it wrong. That's why it's important to keep in mind that at some point and time, we were all doing it wrong, including myself.
Whether it is pride or just the belief that these theories won't work, this pushback is still alive and well in our industry. Remember that you are trying to change culture and habits that have been in place for years. Typically the pushback comes from supporting departments but it is absolutely not isolated to them. After so many years of trial and error you might think that everyone has adopted these principles but facts are facts and it just isn't so.