UiPath-ADPv1 Generic Automation Development Practice Question
A developer needs a workflow that accepts a list of invoice numbers, processes each one, and returns a collection of the successfully processed invoices to the caller. The workflow will be invoked from several places in the project. Which implementation correctly exposes this contract?
⚠ Common exam trap
The trap here is assuming that returning a reference type through an In argument is sufficient, when the caller needs a declared output to consume the results reliably.
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
✓
Declare an In argument of type List(Of String) for the invoice numbers and an Out argument of type List(Of String) for the processed results, then invoke the workflow with those arguments bound.
A reusable workflow should declare its data contract explicitly: inputs flow in through In arguments and results flow out through Out arguments. Using List(Of String) on both sides preserves the collection structure and lets every caller bind arguments at the Invoke Workflow File activity. This keeps the workflow testable and prevents callers from depending on implicit mutations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Declare both the invoice numbers and the results as In arguments, and have the workflow modify the results list in place.
Why it's wrong here
An In argument is intended for input; mutating the object it references does not reliably surface results back to the caller and breaks the contract. Even where a reference type allows in-place mutation, the caller has no declared output to consume and the behavior is implicit and error-prone. Results should be returned through a dedicated Out argument so the interface is explicit.
- ✓
Declare an In argument of type List(Of String) for the invoice numbers and an Out argument of type List(Of String) for the processed results, then invoke the workflow with those arguments bound.
Why this is correct
In arguments carry data into an invoked workflow and Out arguments return data to the caller, which matches the stated contract exactly. Typing both as List(Of String) preserves the collection shape on both ends, and binding them at each Invoke Workflow File call keeps the workflow reusable. This is the standard, explicit way to pass structured data across workflow boundaries.
- ✗
Declare a single In/Out argument of type List(Of String) and return the results by clearing and repopulating the same list.
Why it's wrong here
An In/Out argument is passed by reference and can carry results, but using one argument for both the input set and the output set conflates two distinct pieces of data. The caller loses the original invoice list once it is overwritten, and the workflow becomes harder to test because the input is destroyed. Separate In and Out arguments keep the responsibilities clear.
- ✗
Declare an Out argument of type String that contains the results joined with a delimiter, then split it in the caller.
Why it's wrong here
Serializing a collection into a delimited string forces the caller to parse it and introduces ambiguity if any invoice number contains the delimiter. It discards the collection type that the caller expects and adds unnecessary conversion logic on both sides. Passing the List(Of String) directly through an Out argument is simpler and type-safe.
About these practice questions
This UiPath-ADPv1 question is part of Courseiva's 276-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official UiPath exam blueprint
This UiPath-ADPv1 practice question is part of Courseiva's free UiPath 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 UiPath-ADPv1 exam.