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This article is a mess. It appears to be talking about a term with three (or only two?) usages, each of which merits its own section. Each sentence makes sense - the article seems incoherent and possibly contradictory. GRBerry 02:32, 19 May 2006 (UTC)

Done. References are still needed, though. 66.229.160.94 09:27, 3 August 2006 (UTC)

[edit] Needed?

Negative control redirects to Scientific control, which does a good job of telling what N/P controls are. How about deleting this messy article, and fill in on the other one? --David Munch 16:03, 17 June 2007 (UTC)