# Data-flow diagrams

<h2>How to use this clinic</h2>
<p>This clinic brings together authentic QCAA external-assessment questions about data-flow diagrams and exchange-system relationships.</p>
<ol>
<li>Attempt each question on paper without looking ahead.</li>
<li>Compare your answer with the worked response and explanation.</li>
<li>Use the complete QCAA sample response and marking criteria to check what earned the marks.</li>
<li>Add anything missing to your answer in a different-coloured pen.</li>
</ol>
<div style="background:#eef6fb;border-left:4px solid #2b6f91;border-radius:4px;padding:.8rem 1rem;margin:1rem 0;"><p style="margin:0;"><strong><a href="https://mr.napper.au/attachments/23">Download Data-flow diagrams (PDF)</a></strong></p><p style="margin:.5rem 0 0;">The PDF includes five QCAA questions from 2021–2025, worked responses, explanations and complete marking-guide extracts.</p></div>