Tridion DTAP Clarified - How many Content Delivery setups do I need?
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I asked about developer setup for Tridion DTAP (development, test, acceptance, and production) [in this other question][1], but understand the example didn't match a typical DTAP scenario.

Chris Summers explains the CM-side well in his [Fifth Tridion Environment post][2]. But for clarity, could I get help understanding the ideal setup?

## CMS environments ##

* D = Development
* T = Test
* A = Acceptance
* P = Production

I understand typical authors only use Production and publish from CMS Production to "Live" and "Staging." The other environments are for development.

## CD? ##

**Does "Live and Staging" apply to each of the other environments--does that mean 8 content delivery setups (per website)?**

And if so, where is it okay to consolidate--fewer CMS environments? Fewer target types?

  [1]: http://stackoverflow.com/questions/11166754/proper-dtap-setup-for-content-delivery
  [2]: http://www.urbancherry.net/blogengine/post/2010/02/06/The-Fifth-Environment.aspx