A step is due the day the part reaches it, plus its estimated hours in working days, plus your plant's slack. Outside work is due on the vendor's promise date. Floor › Late lists late steps, late work orders and requests past the day they were needed, longest late first.
The emails
The first working morning a step is late, its owner is emailed: the supervisor of the machine's team (for outside work and moves, the supervisor of the team the request is with; at a bay, the bay's person). After a set number of working days their manager in the org chart is emailed, then the next level up. Your admin sets the timing on the web, in Plant setup › Rules.