This talk isn't about security. It's about how any security team can measure and improve its overall performance, and also better satisfy your non-technical bosses and clients. Besides "are we secure?", bosses want to know "is the team performing well?" At some point, you'll probably be asked for a scorecard or dashboard - "and make it simple". Maybe you've already tried to create a scoring spreadsheet only to find that it's full of fudge factors, incomprehensible formulas, or made-up shit. There is a better way. This session presents a credible and powerful method - the Thomas Scoring System (TSS) -- to estimate an aggregate performance index from a grab bag of ground-truth metrics and evidence. TSS can help you present solid, defensible metrics to the bosses, and it can also help your team learn what really drives performance and how to improve. Several case studies will be demonstrated: Vendor Risk Assessment, Vulnerability Management, and Security Operations. TSS is Creative Commons and open source. Excel and R+Shiny tools will be released.