Write for humans, not for robots

The recent San Francisco Declaration On Research Assessment (DORA) aims at improving how scientific research is evaluated. To do this, the declaration wants not only to improve the evaluation process itself, but also to modify how research is reported, in particular by having authors of scientific articles cite original articles in preference to review articles. But this would be bad scientific practice: researchers should not have to worry about the reliability of bibliometrics when they do research or write articles.

As a method of evaluating research, bibliometrics has many well-known shortcomings. The DORA denounces some of these shortcomings, and proposes remedies. Some of these remedies are common-sense ideas, such as stopping using journal impact factors, and evaluating the contents of articles (and other research outputs) rather than relying on bibliometrics.
Some other proposals aim at improving bibliometrics. It is not obvious that this would be good, because bibliometrics will always encourage bad practices, such as trading citations and authorships, and splitting results into small articles. Eliminating some of the flaws at the expense of making metrics more complicated may not be worth the trouble.

And the proposals 10 and 16, which want authors of scientific articles to cite  original articles in preference to review articles, are downright pernicious. The problem is no longer to improve bibliometrics itself, but to modify how articles are written, with the aim of making bibliometrics more reliable. So the DORA claims that bibliometrics is so flawed that its use should be much reduced, but that it is so important that great efforts should be made to improve it -- efforts not limited to modifying the metrics themselves. In this sense, the DORA is self-contradictory. 

This might not matter too much, if citing original articles was good scientific practice. But it is not. The original literature is a tangled mess of more or less reliable and understandable texts. Review articles play the vital roles of making sense of it, and of promoting common, generally accepted terminology and ideas. Writing review articles is in some cases more useful than doing original research, and should be encouraged. Moreover, researchers often do not learn of existing results from original articles, but from other texts, which may be clearer or more accessible than the original articles. Citing the original articles would often mean citing articles without having read them, which is obviously bad practice.

Remember why articles cite earlier works in the first place: to avoid repeating material which is available elsewhere, and to help readers find the origins and proofs of results which are built upon. To do this efficiently, one should cite as few articles as necessary, and select them based on clarity, reliability and ease of access. (Open access should surely be favoured.) There is no reason to favour original articles. Favouring original articles serves another purpose: as the DORA puts it, to "give credit where credit is due". But the purpose of research articles is not to give credit. An article's contribution to the history of its subject is only a byproduct, and should not take precedence over its primary purpose of reporting scientific ideas.

Bibliometrics was supposed to help with the task of giving credit, but now we are told that it will not work unless we think more about bibliometrics than about readers when we write articles. This should be resisted: write for humans, not for robots.