The Artima Developer Community
Sponsored Link

News & Ideas Forum (Closed for new topic posts)
Building Adaptable Systems

0 replies on 1 page.

Welcome Guest
  Sign In

Go back to the topic listing  Back to Topic List Click to reply to this topic  Reply to this Topic Click to search messages in this forum  Search Forum Click for a threaded view of the topic  Threaded View   
Previous Topic   Next Topic
Flat View: This topic has 0 replies on 1 page
Bill Venners

Posts: 2248
Nickname: bv
Registered: Jan, 2002

Building Adaptable Systems Posted: Mar 31, 2003 2:50 AM
Reply to this message Reply
Advertisement
Dave Thomas says, "The mistake people make is saying, OK, I'm going to write these components. That means I need a framework, and starting with the framework. I can guarantee that any project that starts by writing a framework will never finish writing the framework."

ead this Artima.com interview with Pragmatic Programmers Andy Hunt and Dave Thomas:

http://www.artima.com/intv/adapt.html

Here's another excerpt:

Dave Thomas: It also comes down to our old friend the cost of change curve. The cost of change curve basically says that the cost of making a change increases exponentially over time. There are various expressions of it. For example, the cost of fixing a bug after a system has been deployed is 1000 times more than fixing it when the system is being designed. But the general agreement is that the curve goes up non-linearly as time goes on.

The meter of the cost of change curve starts running when you make a decision. If you don't make a decision, then there's nothing to change, and the curve is still flat.

Andy Hunt: The world can change its mind as many times as it wants. If you haven't made a decision or committed yet, your cost is zero.

Dave Thomas: So rather than make a whole bunch of decisions up front and start the meter running, we try to defer each decision as long as we can. We end up with a lot of small cost of change curves, because each one hasn't had a chance to get up too high. Cumulatively, the effect of adding up those small curves is a lot less than having one curve that starts at zero that ramps up to infinity real quickly.


What do you think of Dave and Andy's comments?

Topic: Q & A Session with Jboss's Marc Fleury Previous Topic   Next Topic Topic: Orthogonality and the DRY Principle


Sponsored Links



Google
  Web Artima.com   

Copyright © 1996-2014 Artima, Inc. All Rights Reserved. - Privacy Policy - Terms of Use - Advertise with Us