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Business Impact Analysis
This episode of the ISACA Certified Information Systems Auditor (CISA) exam prep series covers business impact analysis. It explains why ranking the criticality of processes and systems is the essential foundation for all continuity planning, introduces the three core questions that structure the exercise, explores the trade-off between downtime and recovery costs, and describes how the results feed directly into recovery strategy and disaster recovery planning.
What this episode covers
- What a BIA is — the critical first step in continuity strategy, identifying critical processes, technology, timeframes, priorities, and interdependencies.
- Stakeholder involvement — the need for senior management sponsorship and approval, plus broad technology and end-user participation.
- Measuring impact — sorting downtime into high, medium, and low bands expressed in time, data loss, and financial value.
- Three data collection methods — questionnaires, interviews, and workshops, with transaction volume history as supporting evidence.
- Three driving questions — which processes are critical, which resources support them, and how fast must recovery occur.
- Downtime vs. recovery cost trade-off — the U-curve model pointing to the optimal recovery strategy investment.
- Four criticality classes — critical, vital, sensitive, and nonsensitive, and how rankings flow into RTO and RPO.
Watch the full episode above for the worked examples and detailed explanations of each concept.
Frequently Asked Questions
What is a business impact analysis and why is it necessary?
A business impact analysis is the critical first step in building a continuity strategy. It evaluates critical processes and the technology supporting them, then determines timeframes, priorities, and the resources needed to recover, including the interdependencies between them. It is necessary because not all systems and processes can be protected equally, and without this analysis an organisation risks over-protecting trivial functions while leaving the truly vital ones inadequately covered.
What three questions drive the business impact analysis exercise?
The first question asks which business processes really matter and how critical each is, looking for signals such as health and safety support, lost income, legal requirements, or broad user impact. The second question asks which information resources support those critical processes, because a server is only a disaster risk if it underpins something critical. The third question asks about the critical recovery period, meaning how fast processing must resume before losses become unacceptable, which varies greatly between a brokerage and a factory.
How do downtime cost and recovery cost trade off in business impact analysis?
Downtime cost climbs the longer an outage lasts as idle staff, lost sales, and delays accumulate, eventually levelling off when the business simply cannot function. Recovery cost falls as the organisation accepts a longer recovery time, because a relaxed target is cheaper to prepare for while a stringent target requires a much higher fixed investment paid whether or not disaster strikes. Adding the two curves produces a U-shape, and the smartest strategy sits at the lowest point of that curve.
How are systems ranked by criticality after a business impact analysis?
Systems are ranked by combining impact with likelihood of disruption across four classes. Critical functions cannot run without identical replacements and cannot revert to manual operation. Vital functions can run manually but only for a brief time. Sensitive functions can run manually for longer, though it is awkward and costly. Nonsensitive functions can pause for an extended period with little harm. These rankings then feed the choice of recovery strategy and the setting of recovery point and recovery time objectives.
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Reference: This article is based on concepts discussed in Business Impact Analysis.