Great analogy. I also liked this one, by Joel Spolsky, relating to context switching and the cost of multitasking: <a href="http:&#x2F;&#x2F;www.joelonsoftware.com&#x2F;articles&#x2F;fog0000000022.html" rel="nofollow">http:&#x2F;&#x2F;www.joelonsoftware.com&#x2F;articles&#x2F;fog0000000022.html</a>