"Wait a minute," says Mark. "There is something wrong here. In our company, we have to come out with a new product every six months or so. Therefore, if we increase all the safety times, we increase the lead time of all projects. That means that more projects will be going on at the same time." I don't see his problem. "Correct, but what's your problem?" I ask. Slowly, he continues. "More projects means multi-tasking. And according to what we said, it means that lead times will lengthen. So what you are telling us is that if we add more safety time it won't help because the lead times will
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