Abstract
The importance of being able to demonstrate the effectiveness of information services, in terms of value supplied for money spent, needs no emphasis from me. Industry, in particular, has to show a reasonable return on invested capital, and information services can expect to be supported only as long as they demonstrate their worth. Ideally it would be best to be able to put a quantified value on the information supplied, but there is as yet no acceptable method for measuring, or even estimating this value. This is an area in which research needs to be done, and I hope it will be done in the not-too-distant future. However, the fact remains that at present we cannot, except in a very few cases, estimate this value; and although I have recently been taken to task for refusing to grasp this nettle, I remain unrepentant and continue to insist that for the time being we will have to do our best without it.

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