Chapter 3 introduces our approach to measuring the transparency of deliberations in state legislatures. We discuss our coding strategies and provide descriptive information about our temporal data on the adoption of open deliberation laws and exemptions to those laws. This summary of the data provides important context, including general patterns in the timing and geography of the transparency movement and its recent decline. Importantly, the chapter includes a discussion on enforcement of these laws, demonstrating empirically that they are not written as token gestures toward accountability. They are intended to provide meaningful, powerful mechanisms to keep legislative deliberation public. Finally, we develop event history models of transparency adoption and exemption across the states to better understand the systematic factors associated with the decisions to open or close legislative meetings. These models generalize the historical patterns we uncover in Chapter 2, demonstrating in particular the pivotal role of a powerful press corps in pushing the transparency initiative forward and sustaining it over time.