There are two parts to your question.
On the second part, which is the most straightforward part, no, we don't work on a zero-based budgeting in the sense that we don't every year rebuild everybody's budget from nothing.
What actually happens is that every time there is a funding approval—if there are many years or even an ongoing portion to this approval—once it's been through Treasury Board, it's considered briefed into the reference levels. Then the funding for each year appears in a fresh appropriation act that's put in front of Parliament.