Zero Based Budgeting as opposed to what Governments do now.  

"Zero-based budgeting is an approach to planning and decision-making that reverses the working process of traditional budgeting. In traditional incremental budgeting, departmental managers justify only variances versus past years based on the assumption that the "baseline" is automatically approved."

"However, in zero-based budgeting, everything that is to be budgeted needs to be approved. Since zero-based budgeting requires an approval for budgeting, this means that budgets per year are started from a zero-base and is completely started over every year."

In actual operation, some things, like PERS, or Federal mandates, or items required in the Oregon Constitution (Lottery expenditures) can't start at "Zero"; ZBB is really more of a denial of  "We've Always spent that much or for those things" as a budget starting point.  It is more of "Do we really need/or can we really afford" this budget item?