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<h1>Verifying Requirements</h1>
<p>
The queries (i.e. the system requirements) are verified 
from the verifier interface of UPPAAL2k. A verification is always
performed according to the settings specified in the
<a href="@Menu Bar/Options">Options menu</a> of the main menu bar.</p>

<p>The selected queries are verified when the button 
named "Model Check" is pressed. The verification output
is displayed in the log window named "Status", at the
bottom of the verifier window. The result is also indicated by
the circular markers in the rightmost column of the 
Overview window. A grey marker indicates that the truth
value of the property is unknown, a green marker that the property
is satisfied, and a red marker that the property is not satisfied.</p>

<p>In case the <em>over approximation</em> or the <em>under
approximation</em> options are enabled, the output of the verifier
might be that property is "maybe satified". This happens when the
verifier cannot determine the truth value of the property due to the
approximations used.</p>

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