October 1999
Intermediate to advanced
224 pages
3h 52m
English
Content preview from Extreme Programming ExplainedBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 4. Four Variables
We will control four variables in our projects—cost, time, quality, and scope. Of these, scope provides us the most valuable form of control.
Here is a model of software development from the perspective of a system of control variables. In this model, there are four variables in software development:
Cost
Time
Quality
Scope
The way the software development game is played in this model is that external forces (customers, managers) get to pick the values of any three of the variables. The development team gets to pick the resultant value of the fourth variable.
Some managers and customers believe they can pick the value of all four variables. "You are going to get all these requirements done by the first of next month with exactly ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.