Can someone please explain the difference between efficacy and effectiveness? (within clinical psychology)?

Answer 1

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.

"Efficacy refers to a treatment that does more good than harm among those who receive it. Efficacy is established in the controlled setting of a clinical trial. This reflects, as near as possible, ideal conditions with selected patients.

In contrast, a treatment's effectiveness is determined by whether it does more good than harm in those to whom it is offered. This specifically refers to general populations that may have less selected patients with more variations in comorbidity, clinician involvement, patient compliance, follow-up costs, etc. Effectiveness refers to the generalizability of an intervention, while efficacy refers to internal validity."

Hope this helps. The reference to this is: www.cancernetwork.com/journals/oncology/qol1195q.htm

Answer 2

Efficacy Vs Effectiveness

Answer 3

Efficacy is the ability to effect some event or change. A person feels efficacious when whatever he does produces the results he wants and he feels he can change his environment. A person who does not feel efficacious feels that nothing he does will make a change, leading to low self-esteem.
Effectiveness is how well a procedure performs what it purports to perform. For example, how effective is Cognitive Behavior Therapy in the treatment of depression (how successful is the treatment).

Answer 4

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Can someone please explain the difference between efficacy and effectiveness? (within clinical psychology)?

Answer 5

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