easyMultiple Choice
CISA Practice Question: When implementing a commercial off-the-shelf…
When implementing a commercial off-the-shelf (COTS) system, what is the MOST important factor?
⚠ Common exam trap
Many 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.
Answer choices
Why each option matters
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.
Answer analysis
Option-by-option breakdown
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
Extensive customisation defeats the purpose of a COTS product: it raises cost, breaks vendor support and complicates patching and upgrades. COTS selection instead matches the product's built-in functionality to requirements, accepting configuration only. Customisation would be the right approach for bespoke development, not for a commercial off-the-shelf deployment.
- ✗
Lowest total cost
Why it's wrong here
Lowest total cost ignores whether the COTS product meets the organisation's functional and control requirements, which determines whether it can be deployed at all. Cost is a secondary selection criterion applied after requirements are satisfied. Lowest total cost would be decisive only when several vendors' products already meet every mandatory requirement equally.
- ✗
Vendor reputation
Why it's wrong here
Vendor reputation is a secondary due-diligence factor; it does not establish that the product satisfies the organisation's stated functional, technical and security requirements, which govern COTS selection. Reputation would be the deciding factor only after multiple candidate products have each demonstrably met all mandatory requirements.
- ✓
Alignment with business processes with minimal modification
Why this is correct
COTS systems deliver value through standardised, vendor-supported functionality; heavy customisation breaks upgrade paths, voids support, and inflates cost. Aligning business processes to the product with minimal modification preserves those benefits, making it the most important factor during implementation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CISA practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISA exam.