Parallel implementation

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Definition

The old and new systems run side by side until the new one is trusted; safe but costly.

Example: Run both payroll systems for a month.

Found in: syllabus, sample exam and familiarisation guidelines, school notes, past SDD papers.

Short version to memorise (key terms bank)

Old and new run side by side.

Where you'll use it in the test

Syllabus area: Y12 SE Project.

Question types it can appear in

Multiple choice: Pick the option that matches the definition or example.
Matching or table: Match it to its description, example or category.
Short answer: Define, outline or explain it and tie it to the scenario.

Where it has appeared in the paper

The Software Engineering Project (Part A, B). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

“The old and new systems run side by side until the new one is trusted; safe but costly.” Then apply it: Run both payroll systems for a month.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

From the linked past questions

Identify: Recognise and name. (2025 HSC Q1 (1 mark): Implementation methods)

Official worked answer

Sample exam Q5 (1 mark): Implementation methods (1 mark): official criteria and sample answer

Criteria

1: Correctly matches the implementation methods.

Sample answer

(i) Direct. (ii) Phased. (iii) Parallel. (iv) Pilot.

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Go deeper

Flashcard: Parallel implementation in The Software Engineering Project (Year 12) · study that set
Memorise: Implementation (conversion) methods
Key terms bank entry: Parallel implementation
Full term page: every question, note and marking comment for Parallel implementation

Check yourself

Explain “Parallel implementation” in one sentence, give an example, and name a question type that could test it.

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