- A
The 'short_description' field is read-only on the form.
Why wrong: Read-only fields can still be updated via script; the issue is the trigger.
- B
The business rule is updating itself recursively and has been disabled.
Why wrong: Recursive updates would cause a loop, not prevent execution; the business rule is simply not triggered.
- C
The business rule is set to run on the server, but the custom UI page uses client-side GlideRecord which does not trigger server-side business rules.
Client-side GlideRecord operations do not invoke server-side business rules; they go directly to the database without triggering 'after' update logic.
- D
The 'short_description' field is not in the business rule's 'Fields to update' list.
Why wrong: Business rules do not have a 'Fields to update' list; they use conditions and script logic.
Quick Answer
The answer is that the business rule is set to run on the server, but the custom UI page uses client-side GlideRecord, which does not trigger server-side business rules. This is because business rule execution triggers are fundamentally server-side operations—they fire only when a record is saved through server-side processes like a form submit, web service, or server-side script. Client-side GlideRecord, used in a custom UI page, runs entirely in the browser and bypasses the server-side business rule engine, so calls to `current.setValue()` and `current.update()` in the rule never execute. On the ServiceNow Certified Application Developer CAD exam, this tests your understanding of the critical distinction between client-side and server-side data operations, a common trap where candidates assume all GlideRecord calls trigger business rules. A helpful memory tip: think of business rules as "server-side guards"—they only activate when the server sees the save, not when the browser makes the change.
SNOW-CAD Practice Question: Automating application logic with business rules and scripts
This SNOW-CAD practice question tests your understanding of automating application logic with business rules and scripts. 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.
A ServiceNow administrator notices that a business rule designed to update the 'short_description' field on the 'incident' table is not executing when a user changes the field via a custom UI page that uses GlideRecord. The script in the business rule uses current.setValue() and current.update(). What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The business rule is set to run on the server, but the custom UI page uses client-side GlideRecord which does not trigger server-side business rules.
Option C is correct because client-side GlideRecord (g_form.getReference or direct GlideRecord in a UI page) runs entirely in the browser and does not trigger server-side business rules. Business rules execute only when a record is saved via server-side operations (e.g., form submit, web service, or server-side script). Since the custom UI page uses client-side GlideRecord, the update bypasses the business rule engine entirely.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The 'short_description' field is read-only on the form.
Why it's wrong here
Read-only fields can still be updated via script; the issue is the trigger.
- ✗
The business rule is updating itself recursively and has been disabled.
Why it's wrong here
Recursive updates would cause a loop, not prevent execution; the business rule is simply not triggered.
- ✓
The business rule is set to run on the server, but the custom UI page uses client-side GlideRecord which does not trigger server-side business rules.
Why this is correct
Client-side GlideRecord operations do not invoke server-side business rules; they go directly to the database without triggering 'after' update logic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'short_description' field is not in the business rule's 'Fields to update' list.
Why it's wrong here
Business rules do not have a 'Fields to update' list; they use conditions and script logic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume any GlideRecord call triggers business rules, but client-side GlideRecord bypasses server-side execution, and the exam tests this specific distinction between client-side and server-side script execution contexts.
Detailed technical explanation
How to think about this question
Client-side GlideRecord (glideRecord in UI scripts or UI pages) uses the AJAX API to perform operations, but these calls are processed as client-side transactions and do not invoke server-side business rules, which require a server-side save context. A common workaround is to use a GlideAjax script include to perform the update server-side, ensuring business rules fire. In real-world scenarios, this distinction is critical when building custom portals or widgets that must enforce business logic.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CAD 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SNOW-CAD question test?
Automating application logic with business rules and scripts — This question tests Automating application logic with business rules and scripts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The business rule is set to run on the server, but the custom UI page uses client-side GlideRecord which does not trigger server-side business rules. — Option C is correct because client-side GlideRecord (g_form.getReference or direct GlideRecord in a UI page) runs entirely in the browser and does not trigger server-side business rules. Business rules execute only when a record is saved via server-side operations (e.g., form submit, web service, or server-side script). Since the custom UI page uses client-side GlideRecord, the update bypasses the business rule engine entirely.
What should I do if I get this SNOW-CAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This SNOW-CAD practice question is part of Courseiva's free ServiceNow 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 SNOW-CAD exam.
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