Dated, but still worth reading: <a href="http:&#x2F;&#x2F;www.joelonsoftware.com&#x2F;articles&#x2F;FiveWorlds.html" rel="nofollow">http:&#x2F;&#x2F;www.joelonsoftware.com&#x2F;articles&#x2F;FiveWorlds.html</a><p>Software development != software development