Script Includes package reusable server behavior with an intentional interface. Keep reusable domain logic separate from one specific form’s presentation.
Before you start
You should understand tables, records and the difference between client-side and server-side scripts. Work in a development instance with representative permissions. Identify execution scope, transaction timing and the current user before attributing behavior to a platform script or business rule.
The practical goal is to reason through this situation: Several rules call a helper that validates a request’s eligibility. Read the walkthrough first, then try the interview exercise before opening its answer. The important part is explaining the decision and its consequences, rather than remembering a definition alone.
Step-by-step walkthrough
Step 1: Define explicit inputs
A reusable server method should not rely on one form’s ambient state.
Step 2: Define outcome and permission
Specify validation, authorization and returned data.
Step 3: Keep responsibilities focused
Reuse domain behavior without coupling it to presentation.
Worked scenario
Several rules call a helper that validates a request’s eligibility.
Two business rules call an eligibility helper with a request ID and documented context. The helper returns an explicit eligible or rejected result, rather than changing unrelated form state. If it accesses protected data, its security expectations must be part of the contract, not an assumption inherited from the first caller.
Common mistake
A general helper with hidden user or record assumptions becomes difficult to reuse safely.
Verify the behavior
Test different callers, invalid IDs and unauthorized access under the intended scope.
Interview exercise
Design a reusable method.
Answer and reasoning
Specify inputs, outputs and authorization expectations, returning a clear result rather than depending on ambient form state.
Continue learning
Compare the scenario with the ServiceNow interview questions and test your understanding with the ServiceNow MCQs. For terminology and implementation details, consult the reference material.