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.
When implementing a commercial off-the-shelf (COTS) system, what is the MOST important factor?
Customization to fit all requirements
Why wrong: Excessive customization defeats the purpose of COTS.
Lowest total cost
Why wrong: Lowest cost may not align with business needs and could increase long-term costs.
Vendor reputation
Why wrong: Reputation is important but alignment with business processes is key.
Alignment with business processes with minimal modification
Minimal modification reduces risk and cost.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Alignment with business processes with minimal modification
When implementing a commercial off-the-shelf (COTS) system, the most important factor is alignment with business processes with minimal modification. COTS systems are designed to provide standardized functionality; extensive customization undermines the core benefits of reduced cost, faster deployment, and easier vendor support. Modifying the COTS codebase creates a 'forked' version that complicates patch management, increases testing overhead, and risks incompatibility with future vendor updates, directly contradicting the acquisition rationale.
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.
Customization to fit all requirements
Why it's wrong here
Excessive customization defeats the purpose of COTS.
Lowest total cost
Why it's wrong here
Lowest cost may not align with business needs and could increase long-term costs.
Vendor reputation
Why it's wrong here
Reputation is important but alignment with business processes is key.
Alignment with business processes with minimal modification
Why this is correct
Minimal modification reduces risk and cost.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse 'customization' (modifying source code) with 'configuration' (using built-in parameters), and mistakenly believe that tailoring the software to every requirement is the goal, when in fact minimizing modification is the key to preserving the COTS benefits of low cost and easy maintenance.
Detailed technical explanation
Under the hood, COTS systems rely on a standardized database schema, API contracts, and configuration tables. When an organization customizes the source code (e.g., modifying stored procedures or adding custom modules), it breaks the vendor's upgrade path—each new release must be manually merged, often requiring regression testing of all custom logic. In practice, a COTS ERP system like SAP or Oracle E-Business Suite is designed to be configured via parameter tables and business rules, not by altering core code; alignment with business processes means adapting workflows to the software's built-in best practices, which reduces the risk of 'technical debt' and ensures seamless patch application.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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What to study next
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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: Alignment with business processes with minimal modification — When implementing a commercial off-the-shelf (COTS) system, the most important factor is alignment with business processes with minimal modification. COTS systems are designed to provide standardized functionality; extensive customization undermines the core benefits of reduced cost, faster deployment, and easier vendor support. Modifying the COTS codebase creates a 'forked' version that complicates patch management, increases testing overhead, and risks incompatibility with future vendor updates, directly contradicting the acquisition rationale.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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