<unk>  was developed by Naomi Feil for older people with cognitive impairments and dementia. Feil's own approach classifies individuals with cognitive impairment as having one of four stages in a continuum of dementia. These stages are:
Mal orientation
Time Confusion
Repetitive Motion
Vegetative state.
The basic principle of the therapy is the concept of<unk>  or the reciprocated communication of respect which communicates that the other's opinions are acknowledged, respected, heard, and (regardless whether or not the listener actually agrees with the content), they are being treated with genuine respect as a legitimate expression of their feelings, rather than marginalized or dismissed.<unk>  uses different specific techniques, and it has  attracted criticism from researchers who dispute the evidence for some of the beliefs and values of<unk> , and the appropriateness of the techniques; as there are not enough quality evidences proving the efficacy of such method for people with dementia.
Validation therapy
Triage
Action study
Cost Effectiveness of Therapy
Agent study
Quantitative structure-activity relationship
Scientific consensus
Clinical prediction rule