The ethical basis of clinical outcomes measurement is a desire to impr
ove care in a way which will increase both clinical effectiveness and
value for money-beneficence as well as competence. To date in the U.K.
, any debate about producing comparative indicators of clinical outcom
es has been concerned mainly with the unfairness to individual doctors
or clinical teams of judging their performance on this basis. There h
as been less interest in the prime purpose of such production, which i
s to increase the accountability and effectiveness of the NHS as a pub
licly funded service. Rather than working to improve clinical effectiv
eness and outcomes within clinical services, health authorities which
wish to improve outcomes for their populations have been encouraged si
mply to shift the contract to another provider of care. The key issue
on which the ethics of either action rests is the extent to which the
attribution of outcome to intervention is valid and reliable and, ther
efore, that judgements about performance are just and thus ethical. Th
e consequence of unjust judgements may be to increase the inequalities
that medical care resource allocation should attempt to reduce. (C) 1
998 Elsevier Science Ltd. All rights reserved.