👉 None efficacy is a concept in psychology and psychiatry that refers to the lack of effectiveness or efficiency of an intervention, treatment, or practice. It can be defined as the absence of observable improvement in the desired outcome after applying a given intervention or approach. In other words, it means that there is no measurable change in the behavior or condition being addressed, which might not necessarily mean that something is ineffective. This term is often used in the context of clinical practice to describe situations where an intervention appears to
