It made things more consistent from crew to crew to crew. Now, it's the same for all crews. Before ISO, different crews in the melt shop sometimes would add alloys to a heat at different times. Every crew now adds alloys at the same time in the melting process. It might seem as though ISO takes away workers' decision-making authority, but this hasn't been the case.
Variables still exist in making and rolling steel, even if practices are documented.
You have to make decisions daily. Workers will detail any diversion from procedures in their shift notes. We tried to keep it flexible. This way, people wouldn't become mired in insignificant details. The process also has sharpened Miller's and many others' computer skills.