Graham et al. (1) remind us of the current lack of, and need for, a comprehensive theory of rehabilitation. They also suggest that the framework of the World Health Organization's (WHO) International Classification of Functioning, Disability and Health (ICF) (2) might provide elements of such a general theory and be of help in formulating more specific hypotheses. I am in total agreement with these general statements. However, some clarification of terminology, and further reflection on what a theory is and how it can be distinguished from research that deductively tests or inductively generates theory might be useful.
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