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CISA Practice Question: Which THREE of the following are common…
Which THREE of the following are common challenges when integrating a software package with existing legacy systems? (Select exactly three.)
⚠ Common exam trap
Candidates often confuse a solution (custom development or middleware) with the underlying challenge, leading candidates to select 'Need for custom development' as a challenge when it is actually a response to the real challenges of missing APIs, data mismatches, and performance constraints.
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
✓
Lack of documented application programming interfaces (APIs)
Legacy systems often lack well-documented or standardized APIs, making it difficult to establish reliable interfaces for integration. Without clear API documentation, developers must reverse-engineer communication protocols or rely on outdated methods like screen scraping, which increases integration risk and effort.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Availability of modern integration middleware
Why it's wrong here
This is a solution, not a challenge.
- ✓
Lack of documented application programming interfaces (APIs)
Why this is correct
Legacy systems may have undocumented or proprietary interfaces.
- ✓
Performance constraints of the legacy environment
Why this is correct
Legacy hardware/software may be slow or have limited capacity.
- ✓
Data format and schema mismatches
Why this is correct
Legacy systems may use different data structures.
- ✗
Need for custom development to bridge the gap
Why it's wrong here
This is an action taken in response to challenges.
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JA
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.