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Risk-Based Audit Planning
This episode of the ISACA Certified Information Systems Auditor (CISA) exam prep series covers how auditors decide where to focus limited time and resources. It introduces the risk-based approach to audit planning, from building the audit universe and assessing risk factors through to understanding audit risk components and the role materiality plays in shaping a defensible plan.
What this episode covers
- Audit planning horizons — how short-term planning addresses current-year issues while long-term planning watches where technology is heading.
- Audit universe — mapping every auditable process and scoring each one against risk factors to produce a priority-ordered plan.
- Risk factors — the criteria that determine how often a problem occurs and how hard it hits, including financial, regulatory, and operational dimensions.
- Single-audit planning steps — from understanding the organisation’s mission and governance to setting scope, assigning staff, and automating where possible.
- Laws and regulations — how external requirements shape audit scope and what the auditor must verify about the auditee’s compliance obligations.
- Audit risk components — inherent, control, and detection risk, and how overall audit risk emerges from their combination.
- Materiality — how significance of findings is judged and why materiality and acceptable audit risk move in opposite directions.
Watch the full episode above for the worked examples and detailed explanations of each concept.
Frequently Asked Questions
What is the audit universe, and how does it drive audit planning?
The audit universe is a list of every process that could potentially be audited — essentially a map of the whole business. Each process is then scored against defined risk factors to produce an overall risk rating, and the highest-rated processes form the ideal annual audit plan.
What are the four components of audit risk?
The four components are inherent risk (exposure before any controls), control risk (the risk that controls fail to catch an error in time), detection risk (the risk that the auditor’s own procedures miss the error), and overall audit risk (the combined risk of failing to detect a material error). The auditor’s goal is to reduce overall audit risk to a low level.
How does materiality relate to audit risk?
Materiality and acceptable audit risk move in opposite directions: the higher the materiality of a potential error, the less audit risk the auditor should accept. Individual small errors that seem immaterial may also become material when combined with other findings, so the auditor must consider their cumulative effect.
How do laws and regulations affect the audit plan?
External requirements govern how data is handled, retained, and protected throughout its life cycle, so they must be factored into the audit scope and objectives. There are two areas of concern: the legal requirements placed on the audit itself, and the legal duties that fall on the auditee — both shape what the auditor examines and how deeply.
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Reference: This article is based on concepts discussed in Risk-Based Audit Planning.