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Efficacy is the capacity to produce an effect. It is these conditions that distinguish efficacy from the related concept of effectiveness, which relates to change under real-life conditions. -- Wikipedia: "efficacy"
http://wiki.answers.com/Q/Difference_between_efficacy_a...
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Well, efficacy is whether it works or not... whether it has that capacity. Efficiency is not whether it works, but how well it works... how quickly, how many people have to be involved, etc. If you cut down the amount of time it takes or th...
http://wiki.answers.com/Q/What_is_the_difference_betwee...
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The Difference Between "Efficacy" And "Effectiveness" ... Question submitted October 22, 2001: What is the actual difference between the paradigms of Efficacy and Effectiveness as applied to psychotherapy? ... "Efficacy" is the capacity or ability to produce a predicted or intended or desired result. "Effectiveness" is the...
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www.cybershrink.org/s1.html
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Second, the real "major difference" between efficacy and effectiveness research is the profound inability of effectiveness studies to draw causal treatment relationships from the uncontrolled or quasiexperimental approaches that typically confound treatment and patient selection factors.
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psychservices.psychiatryonline.org/cgi/content/full/49/...
psychservices.psychiatryonline.org/cgi/content/full/49/6/834a
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Both internal validity (efficacy) and external validity (effectiveness) are critical aspects of evaluating interventions. The major difference is that effectiveness research relaxes exclusionary criteria and broadens the scope of outcome measurement.
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psychservices.psychiatryonline.org/cgi/content/full/49/...
psychservices.psychiatryonline.org/cgi/content/full/49/6/834
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One issue that highlights the importance of perspective in judging the evidence is the difference between efficacy and effectiveness approaches to research. These terms are frequently assumed to be synonyms and are often used incorrectly in the literature.
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www.jospt.org/issues/articleID.181,type.7/article_detai...
www.jospt.org/issues/articleID.181,type.7/article_detail.asp
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Within the field of clinical psychology (and other medical fields), efficacy is more of a "research" term while effectiveness refers to how a given treatment will "work" in the "real world." Here is something that I found in an article about cancer that might explain it.
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answers.yahoo.com/question/index?qid=20071111125716AAQB...
answers.yahoo.com/question/index?qid=20071111125716AAQB728
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That's the difference between efficacy and effectiveness in real world outcomes," said Jay W. Meyer, PhD, lead author of the paper and a senior researcher of Ingenix, in Eden Prairie, Minnesota.
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www.docguide.com/dg.nsf/PrintPrint/C35FFC3315F32C9F8525...
www.docguide.com/dg.nsf/PrintPrint/C35FFC3315F32C9F85256D3D0049BAC5
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You are seeing this message because your Web browser does not support basic Web standards. Find out more about why this message is appearing and what you can do to make your experience on this site better ... ; CiteULike Connotea Del.icio.us Digg Reddit Technorati Twitter What's this?; ... Vol. 153 No.
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archpedi.ama-assn.org/cgi/content/extract/153/12/1220
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