Quick Answer
The answer is total cost of ownership over the expected life of the system. This is the most important factor because TCO captures all direct and indirect costs—including upfront license fees, annual maintenance, implementation, training, and support—over the system’s full lifecycle, enabling a true apples-to-apples comparison between vendors. On the CISA exam, this question tests your understanding that an IS auditor’s role is to evaluate cost analysis and risk, not to make procurement decisions; a common trap is fixating on lower upfront costs while ignoring recurring fees that inflate long-term expenses. Remember the memory tip: “TCO tells the whole story—upfront is just the first chapter.”
This CISA practice question tests your understanding of information systems acquisition, development and implementation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During the acquisition of a new software package, the procurement team evaluates two vendors. Vendor A offers a lower upfront cost but higher annual maintenance fees. Vendor B has a higher upfront cost but includes three years of maintenance. What is the MOST important factor for the IS auditor to consider?
The upfront cost of each vendor.
Why wrong: Ignores long-term costs.
The vendor's market reputation.
Why wrong: Important but not the primary cost-driven factor.
The total cost of ownership over the expected life of the system.
TCO gives a comprehensive cost comparison.
The organization's budget constraints.
Why wrong: Budget is a constraint, but TCO provides complete picture.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The total cost of ownership over the expected life of the system.
Option D is correct because total cost of ownership (TCO) captures all costs over the system's life, providing a true comparison. Option A is wrong because upfront cost alone is misleading. Option B is wrong because vendor references are important but not the most critical for cost comparison. Option C is wrong because the auditor should not make the decision; they should advise on cost analysis.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The upfront cost of each vendor.
Why it's wrong here
Ignores long-term costs.
The vendor's market reputation.
Why it's wrong here
Important but not the primary cost-driven factor.
The total cost of ownership over the expected life of the system.
Why this is correct
TCO gives a comprehensive cost comparison.
Related concept
Read the scenario before looking for a memorised answer.
The organization's budget constraints.
Why it's wrong here
Budget is a constraint, but TCO provides complete picture.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CISA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which CISA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Information Systems Acquisition, Development and Implementation — This question tests Information Systems Acquisition, Development and Implementation — Read the scenario before looking for a memorised answer..
The correct answer is: The total cost of ownership over the expected life of the system. — Option D is correct because total cost of ownership (TCO) captures all costs over the system's life, providing a true comparison. Option A is wrong because upfront cost alone is misleading. Option B is wrong because vendor references are important but not the most critical for cost comparison. Option C is wrong because the auditor should not make the decision; they should advise on cost analysis.
Identify which CISA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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