A Zero-Based Review (ZBR) is an evaluative exercise—usually applied to budgets, agencies, or policy portfolios—in which every line item, program, or function must be re-justified from a baseline of zero rather than carried forward from the previous period. It is the analytical cousin of zero-based budgeting (ZBB), a technique popularized in the U.S. private sector by Peter Pyhrr at Texas Instruments in the late 1960s and later adopted by the federal government under President Jimmy Carter, who had used it as Governor of Georgia.
In practice, a ZBR forces officials to:
- Identify each discrete activity or "decision unit."
- Describe the activity's purpose, cost, and measurable outputs.
- Rank activities against alternatives, including elimination.
- Reallocate resources to higher-ranked priorities.
Governments use ZBRs to challenge incrementalism, the tendency for budgets to grow by small adjustments to last year's base. Canada's federal Strategic and Operating Review (2011–2012) and the United Kingdom's Treasury-led Zero-Based Capital Reviews under successive Spending Reviews are well-known applications. Defence ministries also conduct zero-based force structure reviews to test whether legacy units still match current threats.
Critics note that true zero-basing is administratively expensive and politically difficult: ministries rarely have the analytic capacity to rebuild a budget annually, and entrenched stakeholders resist program elimination. In response, many jurisdictions apply ZBRs selectively—reviewing one cluster of programs per cycle on a rotating basis—rather than government-wide each year.
For MUN delegates and policy researchers, the term often surfaces in debates over fiscal consolidation, public sector reform, and aid effectiveness, where donors or finance ministries demand evidence that legacy spending still delivers value. It is distinct from a sunset review (which tests whether to renew a program at a fixed expiry) and from a performance audit (which examines execution rather than rationale).
Example
In 2011, the Government of Canada launched a Strategic and Operating Review covering roughly $80 billion in direct program spending, applying zero-based principles to identify savings ultimately announced in Budget 2012.
Frequently asked questions
A standard review adjusts the prior year's baseline up or down, while a zero-based review requires each program to justify its full cost as if it were being proposed for the first time.
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