WJEC A-Level Electronics Component 3: the Extended System Design and Realisation Task (NEA) explained

What Component 3 demands

Component 3, the Extended System Design and Realisation Task, is the non-exam assessment of WJEC Eduqas A-level Electronics. It is where the theory becomes practice: you take a design brief and produce a complete working electronic system, then test and evaluate it. It rewards disciplined design, careful construction and honest, evidence-based evaluation, and it draws on everything from the rest of the course.

This guide gives an overview of the task and how to approach it. The single dot-point page covers the assessment in more detail, and the engineering knowledge itself sits in the other modules, linked below.

What the task is

The task asks you to design, build, test and evaluate a working electronic system that meets a given design brief. It is internally assessed and externally moderated and contributes a set proportion of the overall A-level, with the written Components 1 and 2 carrying the remainder. Because it is coursework, success comes from steady, well-documented work across the whole project rather than a single exam performance.

The stages

The task follows a clear sequence: write a specification from the brief; produce a design using a block-diagram systems approach with justified sub-systems and supporting calculations; realise (build) the circuit, including any microcontroller programming; test each function against the specification with suitable equipment and fault-find; and evaluate the finished system against the brief with evidence and realistic improvements.

How it draws on the rest of the course

A typical project combines an input sub-system (a sensor in a potential divider), processing (a comparator, logic, a 555 timer or a microcontroller), and an output sub-system (a transistor-driven load). These are the building blocks from the core concepts and Components 1 and 2, so revising those modules directly supports the design task.

How to approach it

Specify before building, justify every design decision against the brief with calculations, build carefully, test each function against the specification and record the results, document fault-finding, and base the evaluation on evidence rather than opinion. The most heavily weighted marks are for a brief-driven specification and a justified systems-level design.

For the official specification

WJEC Eduqas publishes the full specification, the non-exam assessment requirements and the assessment criteria at eduqas.co.uk. Always work from the current specification and your centre's guidance, because the task requirements and marking are set by the board.