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	<title>The Old Intense Minimalism &#187; agile</title>
	<atom:link href="http://im.digitalhymn.com/tag/agile/feed/" rel="self" type="application/rss+xml" />
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	<description>Looking for a new self</description>
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		<title>Le quattro leggi Agile di Scrum</title>
		<link>http://im.digitalhymn.com/2009/05/03/le-quattro-leggi-agile-di-scrum/</link>
		<comments>http://im.digitalhymn.com/2009/05/03/le-quattro-leggi-agile-di-scrum/#comments</comments>
		<pubDate>Sun, 03 May 2009 09:08:10 +0000</pubDate>
		<dc:creator>Folletto Malefico</dc:creator>
				<category><![CDATA[Technocracy]]></category>
		<category><![CDATA[agile]]></category>
		<category><![CDATA[lean]]></category>
		<category><![CDATA[scrum]]></category>

		<guid isPermaLink="false">http://im.digitalhymn.com/?p=1069</guid>
		<description><![CDATA[Nei giorni scorsi su una presentazione piuttosto ben fatta ho trovato quattro leggi citate nel contesto di Scrum: Ziv&#8217;s law: specifications will never be fully understood. Humphrey&#8217;s law: the user will never know what they want until after the system is in production (maybe not even then) Wegner&#8217;s lemma: an interactive system can never be [...]]]></description>
			<content:encoded><![CDATA[<p>Nei giorni scorsi su una <a title="Agile is the new waterfall?" href="http://www.slideshare.net/nashjain/agile-is-the-new-waterfall?src=embed">presentazione</a> piuttosto ben fatta ho trovato quattro leggi citate nel contesto di <a title="Wikipedia: Scrum" href="http://en.wikipedia.org/wiki/Scrum_(development)">Scrum</a>:</p>
<ol>
<li>Ziv&#8217;s law: <strong>specifications will never be fully understood</strong>.</li>
<li> Humphrey&#8217;s law: <strong>the user will never know what they want</strong> until after the system is in production (maybe not even then)</li>
<li> Wegner&#8217;s lemma: <strong>an interactive system can never be fully specified nor can it ever be fully tested</strong>. This is the software analogy to Godel&#8217;s theorem.</li>
<li> Langdon&#8217;s lemma: <strong>software evolves more rapidly as it approaches chaotic regions</strong> (taking care not to spill over into chaos)</li>
</ol>
<p>Queste sembrano prese da un post iniziale di <a title="Jeff Sutherland: Origins of Scrum" href="http://jeffsutherland.com/scrum/2007/07/origins-of-scrum.html">Sutherland</a> (o da una <a title="Scrum Development" href="http://groups.yahoo.com/group/scrumdevelopment/message/22311">mailing list</a>, entrambi del 2007), uno dei firmatari dell&#8217;<a title="Agile Manifesto" href="http://agilemanifesto.org/">Agile Manifesto</a>, ma non sembra possibile capire chi siano Ziv, Humphrey, Wegner e Langdon a cui le leggi fanno riferimento. Qualcuno ne sa di più?</p>
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