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<p>of a system can be divided into four stages, each with different definitions: <br/>
* Task definition (informative definition)<br/>
* Conceptual stage (cardinal definition)<br/>
* Design stage (formative definition)<br/>
* Implementation stage (manufacturing definition)</p>

<p>Depending on their application, tools are used for various stages of the systems engineering process:</p>

<p><big>Using models</big></p>
<p><a href="page.php?w=Abstract_model">Model</a>s play important and diverse roles in systems engineering. A model can be defined in severalways,</p><p>
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