With the approval of the International Classification of Functioning, Disability and Health by the World Health Assembly in May 2001, the concurrent use of both health-status measures and the International Classification of Functioning, Disability and Health is expected. It is therefore important to understand the relationship between these two concepts. The objective of this paper is to provide a systematic and standardized approach when linking health-status measures to the International Classification of Functioning, Disability and Health. The specific aims are to develop rules, to test their reliability and to illustrate these rules with examples. Ten linking rules and an example of their use are presented in this paper. The percentage agreement between two health professionals for 8 health-status instruments tested is also presented. A high level of agreement between the health professionals reflects that the linking rules established in this study allow the sound linking of items from health-status measures to the International Classification of Functioning, Disability and Health.

The new language ICF is an exciting landmark event for rehabilitation. It may lead to a stronger position of rehabilitation within the medical community, change multi-professional communication and improve communication between patients and rehabilitation professionals.

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The main finding, that in most conditions categories from each component were common, underscores the need to address all components when assessing functioning and health in patients with chronic conditions.

A formal consensus process integrating evidence and expert opinion based on the ICF framework and classification led to the definition of ICF Core Sets for osteoarthritis. Both the Comprehensive ICF Core Set and the Brief ICF Core Set were defined.