Article:		An Introduction to Extreme Programming
Subject:		Extreme
Date:		2001-06-28 11:06:39
From:		mvr707
The article has a "feel good" touch about it:) Its nice... But what is different? Water-fall: Requirements->Design->Code->Test->Ship Spiral model: R1->D1->C1->T1->S1 Get Feedback R2->D2->C2->T2->S2 Get Feedback ... and so on... So whats so different in Extreme?

Showing messages 1 through 2 of 2.

• Extreme
  2001-06-28 11:21:11  mvr707 [Reply | View]
  
  
  There is something called "Spiral Delta Model"
  This is waterfall folded in the middle and spiralled (Iterated).
  
  RS: Requirements Spec
  FS: Functional Spec
  D: Design
  C: Coding
  UT(P): Unit Test (Plan)
  IT(P): Integration Test (Plan)
  ST(P): System Test (Plan)
  AT (P): Acceptance Test (Plan)
  
  Waterfall:
  RS->FS->D->C->UT->IT->ST->AT
  
  Convert that to a Delta shape with iterations
  
  (RS,ATP)->(FS,STP)->(D,STP)->(C,UTP)->UT->IT->ST->AT
  
  This is a tight Delta Spiral. And after a few
  cycles, we hopefully hit the bulls eye!:)
  
  As we know, different models are appropriate for
  different stuations. So what are the salient differences of Extreme Prog and when is is appropriate?
  
  The article makes good reading but leave hugh and dry
• Extreme
  2001-07-14 18:08:33  chromatic | [Reply | View]
  
  
  The biggest visible differences are that iterations are very short in XP, and that programmers can often go through most of the different stages multiple times in a week. (There may be one relatively large story and task planning session and one acceptance test session per iteration, but most of the rest of the stages are done at least once per day.)
  
  The best way to look at XP is as something that keeps the cost of change very low. There's not a lot explicitly invested in the future. This fits in jobs where the specs can change quickly, or where a job can be delivered in stages, one every six weeks or so.
  
  It's probably not a good fit for defense contractors, and large shrink-wrap software houses might have a hard time adopting it. For situations that require a lot of flexibility with short notice, it can be very useful.