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  <mainDescription>&lt;p>&#xD;
    Scrum does not prescribe specific estimation&amp;nbsp;techniques.&amp;nbsp;&#xD;
&lt;/p>&#xD;
&lt;p>&#xD;
    Estimation by analogy is one&amp;nbsp;technique used by Scrum teams.&amp;nbsp; The mechanism is very simple and consists of&#xD;
    comparing backlog items to similar backlog&amp;nbsp;items that were previously implemented.&amp;nbsp; Lack of&#xD;
    available&amp;nbsp;data points will&amp;nbsp;limit the effectiveness of this technique.&amp;nbsp;&#xD;
&lt;/p>&#xD;
&lt;p>&#xD;
    Planning Poker is a popular iterative approach to estimating.&amp;nbsp; Here are the steps:&#xD;
&lt;/p>&#xD;
&lt;ul>&#xD;
    &lt;li>&#xD;
        Each estimator is given a deck of cards, each card has a valid estimate written on it&#xD;
    &lt;/li>&#xD;
    &lt;li>&#xD;
        The Product owner reads a story and it’s discussed briefly&#xD;
    &lt;/li>&#xD;
    &lt;li>&#xD;
        Each estimator selects a card representing&amp;nbsp;his or her estimate&#xD;
    &lt;/li>&#xD;
    &lt;li>&#xD;
        The cards are turned over so all can see them&#xD;
    &lt;/li>&#xD;
    &lt;li>&#xD;
        Discuss differences (especially outliers)&#xD;
    &lt;/li>&#xD;
    &lt;li>&#xD;
        Re-estimate until estimates converge&#xD;
    &lt;/li>&#xD;
&lt;/ul>&lt;br />&#xD;
&lt;p>&#xD;
    Planning poker cards and an &lt;a href=&quot;http://www.planningpoker.com/&quot;>online version of Planning Poker&lt;/a> are available&#xD;
    from &lt;a href=&quot;http://www.mountaingoatsoftware.com//&quot;>Mountain Goat Software&lt;/a>&#xD;
&lt;/p></mainDescription>
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