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11/15/2002: "Joel Spolsky and Leaky Abstractions"

If this article is the norm for Joel Spolsky's blog, I think this blog should be read by every programmer, no matter what level. Joel says something very true here about the Internet and the facade we've built around it. The Internet, like much that has to do with computers, is based on a set of abstractions. (Joel defines an abstraction as a "simplification of something much more complicated going on under the covers.")

As it turns out, a lot of computer programming consists of building abstractions. What is a string library? It's a way to pretend that computers can manipulate strings just as easily as they can manipulate numbers. What is a file system? It's a way to pretend that a hard drive isn't really a bunch of spinning magnetic platters that can store bits at certain locations, but rather a hierarchical system of folders-within-folders containing individual files that in turn consist of one or more strings of bytes. (Joel Spolsky, "The Law of Leaky Abstractions")

Joel's point is that though abstractions are used to make these technologies more usable, sometimes the reality behind these abstractions leak through. (He brings TCP-IP and Net problems that can arise because of the fact that TCP, which is billed as being so reliable, is built on top of IP, a very unreliable technology.) Hence Joel's Law of Leaky Abstractions: "All non-trivial abstractions, to some degree, are leaky." And we should expect that leakiness in our daily lives, especially when it comes to the Internet.

(Ah, Hal (Helms), I think we've found another reason for that 70% failure rate for software projects that you always talk about.)

This article is just sheer fun -- well written, thoughtful, and how well it describes the often complex and zany world of computer programming and the Internet! But I'll just give you the link and leave you to enjoy it. Comments are appreciated.

http://www.joelonsoftware.com/articles/LeakyAbstractions.html

(Thanks to Patrick Nielsen Hayden and his blog for pointing this source out to me. Read Patrick's comments at: http://www.nielsenhayden.com/electrolite/ (entry for November 13, "Why Systems Fail."))

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