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MELIBEA is a Spanish database that uses a composite formula with eightweighted conditions to estimate the effectiveness of Open Access mandates(registered in ROARMAP). We analyzed 68 mandated institutions for publicationyears 2011-2013 to determine how well the MELIBEA score and its individualconditions predict what percentage of published articles indexed by Web ofKnowledge is deposited in each institution's OA repository, and when. We founda small but significant positive correlation (0.18) between MELIBEA score anddeposit percentage. We also found that for three of the eight MELIBEAconditions (deposit timing, internal use, and opt-outs), one value of each wasstrongly associated with deposit percentage or deposit latency (immediatedeposit required, deposit required for performance evaluation, unconditionalopt-out allowed for the OA requirement but no opt-out for deposit requirement).When we updated the initial values and weights of the MELIBEA formula formandate effectiveness to reflect the empirical association we had found, thescore's predictive power doubled (.36). There are not yet enough OA mandates totest further mandate conditions that might contribute to mandate effectiveness,but these findings already suggest that it would be useful for future mandatesto adopt these three conditions so as to maximize their effectiveness, andthereby the growth of OA.

Estimating Open Access Mandate Effectiveness: The MELIBEA Score