On health, ability and activity: comments on some basic notions in the ICF.

PURPOSE: The purpose of this article is to highlight and at the same time criticize the holistic view of health expressed in the "International Classification of Functioning, Disability and Health (ICF)". Particular attention will be paid to the idea suggested in the ICF that not only the ability to perform a specified action but also its actual performance is included in the person's health. My argument intends to show that this is an untenable position.
METHOD: The theoretical platform of this paper is philosophical action theory. My argument makes particular use of the distinctions between ability, opportunity, activity and will. My analysis also uses some insights from the contemporary philosophical discussion of health concepts.
CONCLUSIONS: Ability (or capacity) and its opposite disability (or incapacity) are essential ingredients in the implicit philosophy of health of the ICF. However, the ICF also puts an emphasis on the actual performance of actions. This is entailed by the performance qualifier that is included in the ICF. I give some arguments for questioning the relevance of this qualifier if it is intended to have a place in the concept of health or have a general function for decisions in health care or rehabilitation. Instead I suggest the introduction of an opportunity qualifier, which could fulfill some of the purposes intended for the performance qualifier.