BWC confidence-building measures: Increasing BWC assurance through transparency and information sharing.

In the absence of a treaty protocol or verification regime, the Biological and Toxin Weapons Convention (BWC) instituted confidence-building measures (CBMs) as a mechanism to increase confidence in compliance by enhancing transparency and mitigating ambiguities regarding states parties' biological activities. While a promising tool to support treaty compliance, low participation, concerns regarding the completeness and accuracy of CBM submissions, a dearth of analysis, and restricted access to many submissions have limited CBMs' value. Through interviews with 53 international experts-38 from BWC delegations and 15 independent experts-we identified concrete opportunities to increase CBMs' value while mitigating the burden on states parties.