og/patterns-blog-3/time-windows.png" width="600px" alt="Figure 1: Time Windows"/>
<br/>
<i><small>Figure 1: Time Windows</small></i>
</center>
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<p>One of the common key requirements for a fraud detection system is <em>low
response time</em>. The sooner the fraudulent action gets detected, the
higher the chances that it can be blocked and its negative consequences
mitigated. This requirement is especially prominent in the financial
domain, where you have one important constraint - any time spent
evaluat