A measure of the collaborative distance a person is from noted evaluator, Michael Scriven, using both direct and indirect authorship of published papers. A person who has written a paper with Michael Scriven has a Scriven Number of 1, a person who has written a paper with another person who wrote a paper with Michael Scriven has a Scriven Number of 2, and so on.
Roy, A., Hobson, K, & Coryn, C. (2012). The Scriven Number. AEA365 A Tip-a-Day by and for Evaluators.